Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,717.9	$ 1,582.1
Investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $17,845.3 and $16,826.7)	18,284.7	17,038.2
Equity securities (cost of $1,289.8 and $1,168.5)	1,848.3	1,735.5
Other invested assets, current	19.0	16.3
Accrued investment income	172.7	168.8
Premium and self-funded receivables	4,438.1	3,968.7
Other receivables	1,680.7	1,063.3
Income taxes receivable	200.6	235.7
Securities lending collateral	1,698.6	969.8
Deferred tax assets, net	244.4	383.0
Other current assets	1,922.1	1,677.5
Assets held for sale	0	906.9
Total current assets	32,227.1	29,745.8
Long-term investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $498.5 and $455.9)	501.3	449.9
Equity securities (cost of $26.8 and $27.4)	31.7	31.3
Other invested assets, long-term	1,691.8	1,542.6
Property and equipment, net	1,848.9	1,801.5
Goodwill	17,082.0	16,917.2
Other intangible assets	8,010.6	8,441.0
Other noncurrent assets	664.8	645.2
Total assets	62,058.2	59,574.5
Liabilities and shareholders' equity
Medical claims payable	6,794.2	6,127.2
Reserves for future policy benefits	68.8	63.1
Other policyholder liabilities	2,598.0	2,073.2
Total policy liabilities	9,461.0	8,263.5
Unearned income	1,003.5	822.7
Accounts payable and accrued expenses	3,447.6	3,426.3
Security trades pending payable	156.1	95.2
Securities lending payable	1,698.2	969.7
Short-term borrowings	100.0	400.0
Current portion of long-term debt	625.0	518.0
Other current liabilities	1,903.6	1,674.7
Liabilities held for sale	0	181.4
Total current liabilities	18,395.0	16,351.5
Long-term debt, less current portion	14,538.3	13,573.6
Reserves for future policy benefits, noncurrent	655.7	723.0
Deferred tax liabilities, net	3,284.2	3,325.2
Other noncurrent liabilities	891.0	836.0
Total liabilities	37,764.2	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 – 270,512,468 and 293,273,830	2.7	2.9
Additional paid-in capital	10,094.4	10,765.2
Retained earnings	13,863.8	13,813.9
Accumulated other comprehensive income	333.1	183.2
Total shareholders' equity	24,294.0	24,765.2
Total liabilities and shareholders' equity	$ 62,058.2	$ 59,574.5