Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 2,113.5	$ 2,151.7
Investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $16,950.0 and $17,120.4)	16,920.0	17,467.4
Equity securities (cost of $1,055.8 and $1,303.7)	1,441.8	1,906.6
Other invested assets, current	19.1	20.2
Accrued investment income	170.8	161.4
Premium and self-funded receivables	4,602.8	4,825.5
Other receivables	2,421.4	2,117.0
Income taxes receivable	316.6	308.9
Securities lending collateral	1,300.4	1,515.2
Other current assets	1,555.7	1,473.9
Total current assets	30,862.1	31,947.8
Long-term investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $550.4 and $500.7)	558.2	504.4
Equity securities (cost of $27.3 and $27.0)	31.0	31.5
Other invested assets, long-term	2,041.1	1,695.9
Property and equipment, net	2,019.8	1,944.3
Goodwill	17,562.2	17,082.0
Other intangible assets	8,158.0	7,958.1
Other noncurrent assets	485.4	512.3
Total assets	61,717.8	61,676.3
Liabilities and shareholders' equity
Medical claims payable	7,569.8	6,861.2
Reserves for future policy benefits	71.9	68.1
Other policyholder liabilities	2,256.5	2,626.5
Total policy liabilities	9,898.2	9,555.8
Unearned income	1,145.5	1,078.1
Accounts payable and accrued expenses	3,318.8	3,651.8
Security trades pending payable	73.1	66.2
Securities lending payable	1,300.9	1,515.3
Short-term borrowings	540.0	400.0
Current portion of long-term debt	0.0	624.3
Other current liabilities	2,816.1	1,861.2
Total current liabilities	19,092.6	18,752.7
Long-term debt, less current portion	15,324.5	14,019.6
Reserves for future policy benefits, noncurrent	631.7	671.3
Deferred tax liabilities, net	2,630.6	2,945.6
Other noncurrent liabilities	994.3	1,035.8
Total liabilities	$ 38,673.7	$ 37,425.0
Commitments and contingencies-Note 13
Shareholders' equity
Preferred stock, without par value, shares authorized - 100,000,000; shares issued and outstanding - none	$ 0.0	$ 0.0
Common stock, par value $0.01, shares authorized - 900,000,000; shares issued and outstanding - 261,238,188 and 268,109,932	2.6	2.7
Additional paid-in capital	8,555.6	10,062.3
Retained earnings	14,778.5	14,014.4
Accumulated other comprehensive (loss) income	(292.6)	171.9
Total shareholders' equity	23,044.1	24,251.3
Total liabilities and shareholders' equity	$ 61,717.8	$ 61,676.3