Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 2,151.7	$ 1,582.1
Investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $17,120.4 and $16,826.7)	17,467.4	17,038.2
Equity securities (cost of $1,303.7 and $1,168.5)	1,906.6	1,735.5
Other invested assets, current	20.2	16.3
Accrued investment income	161.4	168.8
Premium and self-funded receivables	4,825.5	3,968.7
Other receivables	2,117.0	1,063.3
Income taxes receivable	308.9	235.7
Securities lending collateral	1,515.2	969.8
Deferred tax assets, net	280.4	383.0
Other current assets	1,474.6	1,677.5
Assets Held-for-sale, Current	0	906.9
Total current assets	32,228.9	29,745.8
Long-term investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $500.7 and $455.9)	504.4	449.9
Equity securities (cost of $27.0 and $27.4)	31.5	31.3
Other invested assets, long-term	1,695.9	1,542.6
Property and equipment, net	1,944.3	1,801.5
Goodwill	17,082.0	16,917.2
Other intangible assets	7,958.1	8,441.0
Other noncurrent assets	619.9	645.2
Total assets	62,065.0	59,574.5
Liabilities and shareholders' equity
Medical claims payable	6,861.2	6,127.2
Reserves for future policy benefits	68.1	63.1
Other policyholder liabilities	2,626.5	2,073.2
Total policy liabilities	9,555.8	8,263.5
Unearned income	1,078.1	822.7
Accounts payable and accrued expenses	3,651.8	3,426.3
Security trades pending payable	66.2	95.2
Securities lending payable	1,515.3	969.7
Short-term borrowings	400.0	400.0
Current portion of long-term debt	625.0	518.0
Other current liabilities	1,861.2	1,674.7
Liabilities held for sale	0	181.4
Total current liabilities	18,753.4	16,351.5
Long-term debt, less current portion	14,127.2	13,573.6
Reserves for future policy benefits, noncurrent	671.3	723.0
Deferred tax liabilities, net	3,226.0	3,325.2
Other noncurrent liabilities	1,035.8	836.0
Total liabilities	37,813.7	34,809.3
Commitments and contingencies-Note 13
Shareholders' equity
Preferred stock, without par value, shares authorized - 100,000,000; shares issued and outstanding - none	0	0
Common stock, par value $0.01, shares authorized - 900,000,000; shares issued and outstanding - 268,109,932 and 293,273,830	2.7	2.9
Additional paid-in capital	10,062.3	10,765.2
Retained earnings	14,014.4	13,813.9
Accumulated other comprehensive income	171.9	183.2
Total shareholders' equity	24,251.3	24,765.2
Total liabilities and shareholders' equity	$ 62,065.0	$ 59,574.5