Fair Value Measurements (Assets and Liabilities Measured at Fair Value) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Goodwill allocated to Medicare PDP business sold	$ 0	$ 0
Deferred revenue related to transition-related services provided in connection with Medicare PDP business sale	0	0
Transfers of Liabilities, Level 1 to Level 2	0	0
Transfers of Assets, Level 1 to Level 2	0	0
Transfers of Liabilities, Level 2 to Level 1	0	0
Transfers of Assets, Level 2 to Level 1	0	0
Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	340,100,000	230,300,000
Investments at fair value	1,812,500,000	1,560,100,000
Embedded contractual derivative asset	11,200,000	5,300,000
Total assets at fair value	2,163,800,000	1,795,700,000
Recurring [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	272,400,000	495,300,000
Recurring [Member] \| Commercial mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	223,100,000	94,400,000
Recurring [Member] \| Other asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	23,600,000	32,600,000
Recurring [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	25,900,000	25,500,000
Recurring [Member] \| U.S. Agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	7,000,000
Recurring [Member] \| Obligations of states and other political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	842,100,000	518,100,000
Recurring [Member] \| Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	425,400,000	387,200,000
Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lease impairment obligation	7,400,000	0
Level 1 [Member] \| Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	340,100,000	230,300,000
Investments at fair value	25,900,000	25,500,000
Embedded contractual derivative asset	0	0
Total assets at fair value	366,000,000	255,800,000
Level 1 [Member] \| Recurring [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 1 [Member] \| Recurring [Member] \| Commercial mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 1 [Member] \| Recurring [Member] \| Other asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 1 [Member] \| Recurring [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	25,900,000	25,500,000
Level 1 [Member] \| Recurring [Member] \| U.S. Agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 1 [Member] \| Recurring [Member] \| Obligations of states and other political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 1 [Member] \| Recurring [Member] \| Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 1 [Member] \| Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lease impairment obligation	0
Level 2 [Member] \| Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lease impairment obligation	0
Level 3 [Member] \| Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Investments at fair value	200,000	200,000
Embedded contractual derivative asset	11,200,000	5,300,000
Total assets at fair value	11,400,000	5,500,000
Embedded contractual derivative liability	3,200,000
Total liability at fair value	3,200,000
Level 3 [Member] \| Recurring [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 3 [Member] \| Recurring [Member] \| Commercial mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 3 [Member] \| Recurring [Member] \| Other asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 3 [Member] \| Recurring [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 3 [Member] \| Recurring [Member] \| U.S. Agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 3 [Member] \| Recurring [Member] \| Obligations of states and other political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	200,000	200,000
Level 3 [Member] \| Recurring [Member] \| Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Level 3 [Member] \| Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lease impairment obligation	7,400,000
Current [Member] \| Level 2 [Member] \| Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Investments at fair value	1,786,400,000	1,532,300,000
Embedded contractual derivative asset	0	0
Total assets at fair value	1,786,400,000	1,532,300,000
Current [Member] \| Level 2 [Member] \| Recurring [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	272,400,000	495,300,000
Current [Member] \| Level 2 [Member] \| Recurring [Member] \| Commercial mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	223,100,000	94,400,000
Current [Member] \| Level 2 [Member] \| Recurring [Member] \| Other asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	23,600,000	32,600,000
Current [Member] \| Level 2 [Member] \| Recurring [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Current [Member] \| Level 2 [Member] \| Recurring [Member] \| U.S. Agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	7,000,000
Current [Member] \| Level 2 [Member] \| Recurring [Member] \| Obligations of states and other political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	841,900,000	517,900,000
Current [Member] \| Level 2 [Member] \| Recurring [Member] \| Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	425,400,000	385,100,000
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Investments at fair value	0	2,100,000
Embedded contractual derivative asset	0	0
Total assets at fair value	0	2,100,000
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member] \| Commercial mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member] \| Other asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member] \| U.S. Agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member] \| Obligations of states and other political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	0	0
Noncurrent [Member] \| Level 2 [Member] \| Recurring [Member] \| Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments at fair value	$ 0	$ 2,100,000

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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For the disposal group, including a component of the entity (discontinued operation), carrying amount of goodwill (adjusted for any amortization recognized prior to adoption of FAS 142 and impairment charges).

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