Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 4,075.3	$ 2,113.5
Investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $16,991.8 and $16,950.0)	17,163.1	16,920.0
Equity securities (cost of $1,076.1 and $1,055.8)	1,468.5	1,441.8
Other invested assets, current	15.8	19.1
Accrued investment income	164.5	170.8
Premium and self-funded receivables	5,860.8	4,602.8
Other receivables	2,536.6	2,421.4
Income taxes receivable	168.7	316.6
Securities lending collateral	1,079.8	1,300.4
Other current assets	1,781.8	1,555.7
Total current assets	34,314.9	30,862.1
Long-term investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $524.6 and $550.4)	524.4	558.2
Equity securities (cost of $27.2 and $27.3)	31.4	31.0
Other invested assets, long-term	2,240.5	2,041.1
Property and equipment, net	1,977.9	2,019.8
Goodwill	17,561.2	17,562.2
Other intangible assets	7,964.9	8,158.0
Other noncurrent assets	467.9	485.4
Total assets	65,083.1	61,717.8
Liabilities and shareholders' equity
Medical claims payable	7,892.6	7,569.8
Reserves for future policy benefits	71.8	71.9
Other policyholder liabilities	2,221.1	2,256.5
Total policy liabilities	10,185.5	9,898.2
Unearned income	971.9	1,145.5
Accounts payable and accrued expenses	4,014.9	3,318.8
Security trades pending payable	93.5	73.1
Securities lending payable	1,078.9	1,300.9
Short-term borrowings	440.0	540.0
Current portion of long-term debt	928.4	0.0
Other current liabilities	3,581.3	2,816.1
Total current liabilities	21,294.4	19,092.6
Long-term debt, less current portion	14,358.5	15,324.5
Reserves for future policy benefits, noncurrent	666.1	631.7
Deferred tax liabilities, net	2,779.9	2,630.6
Other noncurrent liabilities	883.8	994.3
Total liabilities	39,982.7	38,673.7
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 - 263,747,395 and 261,238,188	2.6	2.6
Additional paid-in capital	8,805.1	8,555.6
Retained earnings	16,560.6	14,778.5
Accumulated other comprehensive loss	(267.9)	(292.6)
Total shareholders' equity	25,100.4	23,044.1
Total liabilities and shareholders' equity	$ 65,083.1	$ 61,717.8