Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,784.6	$ 1,582.1
Investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $17,735.2 and $16,826.7)	18,329.4	17,038.2
Equity securities (cost of $1,268.5 and $1,168.5)	1,887.5	1,735.5
Other invested assets, current	23.0	16.3
Accrued investment income	168.6	168.8
Premium and self-funded receivables	4,547.2	3,968.7
Other receivables	1,333.5	1,063.3
Income taxes receivable	79.4	235.7
Securities lending collateral	1,947.0	969.8
Deferred tax assets, net	162.2	383.0
Other current assets	2,165.8	1,677.5
Assets held for sale	0	906.9
Total current assets	32,428.2	29,745.8
Long-term investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $504.8 and $455.9)	506.7	449.9
Equity securities (cost of $26.9 and $27.4)	31.6	31.3
Other invested assets, long-term	1,678.1	1,542.6
Property and equipment, net	1,829.2	1,801.5
Goodwill	17,082.9	16,917.2
Other intangible assets	8,071.0	8,441.0
Other noncurrent assets	675.9	645.2
Total assets	62,303.6	59,574.5
Liabilities and shareholders' equity
Medical claims payable	6,945.1	6,127.2
Reserves for future policy benefits	61.3	63.1
Other policyholder liabilities	2,190.3	2,073.2
Total policy liabilities	9,196.7	8,263.5
Unearned income	953.5	822.7
Accounts payable and accrued expenses	4,263.8	3,426.3
Security trades pending payable	154.3	95.2
Securities lending payable	1,946.7	969.7
Short-term borrowings	250.0	400.0
Current portion of long-term debt	509.4	518.0
Other current liabilities	1,901.9	1,674.7
Liabilities held for sale	0	181.4
Total current liabilities	19,176.3	16,351.5
Long-term debt, less current portion	14,037.8	13,573.6
Reserves for future policy benefits, noncurrent	643.0	723.0
Deferred tax liabilities, net	3,216.9	3,325.2
Other noncurrent liabilities	852.7	836.0
Total liabilities	37,926.7	34,809.3
Commitment and contingencies-Note 9
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 – 274,470,910 and 293,273,830	2.7	2.9
Additional paid-in capital	10,154.8	10,765.2
Retained earnings	13,744.4	13,813.9
Accumulated other comprehensive income	475.0	183.2
Total shareholders' equity	24,376.9	24,765.2
Total liabilities and shareholders' equity	$ 62,303.6	$ 59,574.5