0001001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - Condensed Consolidated Statements of Income link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - Condensed Consolidated Statements of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - Condensed Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 1006007 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT EVENTS link:presentationLink link:calculationLink link:definitionLink 2202201 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT EVENTS (Policies) link:presentationLink link:calculationLink link:definitionLink 2403401 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT EVENTS (Details) link:presentationLink link:calculationLink link:definitionLink 2104102 - Disclosure - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 2106103 - Disclosure - ACQUISITIONS link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - ACQUISITIONS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2108104 - Disclosure - INVESTMENT SECURITIES link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - INVESTMENT SECURITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - INVESTMENT SECURITIES - Securities Classified as Current and Long-Term (Details) link:presentationLink link:calculationLink link:definitionLink 2411405 - Disclosure - INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Values of Securities (Details) link:presentationLink link:calculationLink link:definitionLink 2412406 - Disclosure - INVESTMENT SECURITIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2413407 - Disclosure - INVESTMENT SECURITIES - Gains (Losses) Within Investment Income (Details) link:presentationLink link:calculationLink link:definitionLink 2414408 - Disclosure - INVESTMENT SECURITIES - Gains and Losses Related to Equity Securities (Details) link:presentationLink link:calculationLink link:definitionLink 2415409 - Disclosure - INVESTMENT SECURITIES - Contractual Maturities of Debt Securities Available for Sale (Details) link:presentationLink link:calculationLink link:definitionLink 2116105 - Disclosure - FAIR VALUE link:presentationLink link:calculationLink link:definitionLink 2317302 - Disclosure - FAIR VALUE (Tables) link:presentationLink link:calculationLink link:definitionLink 2418410 - Disclosure - FAIR VALUE - Financial Assets Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 2419411 - Disclosure - FAIR VALUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2420412 - Disclosure - FAIR VALUE - Significant Unobservable Inputs (Level 3) (Details) link:presentationLink link:calculationLink link:definitionLink 2421413 - Disclosure - FAIR VALUE - Put and Call Options Measured at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2122106 - Disclosure - MEDICARE PART D link:presentationLink link:calculationLink link:definitionLink 2323303 - Disclosure - MEDICARE PART D (Tables) link:presentationLink link:calculationLink link:definitionLink 2424414 - Disclosure - MEDICARE PART D (Details) link:presentationLink link:calculationLink link:definitionLink 2125107 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 2326304 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 2427415 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill by Segments (Details) link:presentationLink link:calculationLink link:definitionLink 2428416 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) link:presentationLink link:calculationLink link:definitionLink 2429417 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2430418 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization and Estimated Future Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2131108 - Disclosure - BENEFITS PAYABLE link:presentationLink link:calculationLink link:definitionLink 2332305 - Disclosure - BENEFITS PAYABLE (Tables) link:presentationLink link:calculationLink link:definitionLink 2433419 - Disclosure - BENEFITS PAYABLE - Activity in Benefits Payable (Details) link:presentationLink link:calculationLink link:definitionLink 2134109 - Disclosure - EARNINGS PER COMMON SHARE COMPUTATION link:presentationLink link:calculationLink link:definitionLink 2335306 - Disclosure - EARNINGS PER COMMON SHARE COMPUTATION (Tables) link:presentationLink link:calculationLink link:definitionLink 2436420 - Disclosure - EARNINGS PER COMMON SHARE COMPUTATION (Details) link:presentationLink link:calculationLink link:definitionLink 2137110 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 2338307 - Disclosure - STOCKHOLDERS' EQUITY (Tables) link:presentationLink link:calculationLink link:definitionLink 2439421 - Disclosure - STOCKHOLDERS' EQUITY - Dividends (Details) link:presentationLink link:calculationLink link:definitionLink 2440422 - Disclosure - STOCKHOLDERS' EQUITY - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2141111 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 2442423 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 2143112 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 2344308 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 2445424 - Disclosure - DEBT - Debt Outstanding (Details) link:presentationLink link:calculationLink link:definitionLink 2446425 - Disclosure - DEBT - Senior Notes (Details) link:presentationLink link:calculationLink link:definitionLink 2447426 - Disclosure - DEBT - Delayed Draw Term Loan Credit Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 2448427 - Disclosure - DEBT - Term Loan Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 2449428 - Disclosure - DEBT - Revolving Credit Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2450429 - Disclosure - DEBT - Commercial Paper and Other Short-term Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 2151113 - Disclosure - COMMITMENTS, GUARANTEES AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 2452430 - Disclosure - COMMITMENTS, GUARANTEES AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 2153114 - Disclosure - SEGMENT INFORMATION link:presentationLink link:calculationLink link:definitionLink 2354309 - Disclosure - SEGMENT INFORMATION (Tables) link:presentationLink link:calculationLink link:definitionLink 2455431 - Disclosure - SEGMENT INFORMATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2456432 - Disclosure - SEGMENT INFORMATION - Segment Results (Details) link:presentationLink link:calculationLink link:definitionLink