Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 381.4	$ 235.9	$ 254.6
Loss (income) from discontinued operations, net of tax	1.1	(4.5)	(48.8)
Adjustments to reconcile net income to net cash provided by operating activities-
Provision for doubtful accounts	26.0	27.0	21.0
Provision for government, class action, and related settlements	(23.5)	(3.5)	(12.3)
Depreciation and amortization	94.7	82.5	78.8
Loss on early extinguishment of debt	2.4	4.0	38.8
Equity in net income of nonconsolidated affiliates	(11.2)	(12.7)	(12.0)
Distributions from nonconsolidated affiliates	11.4	11.0	13.0
Stock-based compensation	24.8	24.1	20.3
Deferred tax expense	6.4	102.7	36.5
Other	9.3	3.0	7.9
(Increase) decrease in assets-
Accounts receivable	(55.1)	(51.3)	(37.1)
Prepaid expenses and other assets	(4.8)	0.6	(12.5)
Increase (decrease) in liabilities-
Accounts payable	6.4	(4.4)	0.8
Refunds due patients and other third-party payors	(0.4)	2.7	(16.2)
Other liabilities	5.0	(5.7)	23.6
Premium received on bond issuance	0	0	4.1
Premium paid on redemption of bonds	(1.7)	(1.9)	(26.9)
Net cash (used in) provided by operating activities of discontinued operations	(1.9)	2.0	9.1
Total adjustments	87.8	180.1	136.9
Net cash provided by operating activities	470.3	411.5	342.7
Cash flows from investing activities:
Purchases of property and equipment	(195.2)	(140.8)	(100.3)
Capitalized software costs	(21.3)	(18.9)	(8.8)
Acquisition of businesses, net of cash acquired	(28.9)	(3.1)	(4.9)
Proceeds from sale of restricted investments	16.9	0.3	1.2
Proceeds from sale of Digital Hospital	10.8	0	0
Purchases of restricted investments	(9.2)	(9.1)	(8.4)
Net change in restricted cash	(3.1)	(14.0)	1.2
Net settlements on interest rate swaps not designated as hedges	0	0	(10.9)
Other	0.5	(0.9)	(0.9)
Net cash provided by (used in) investing activities of discontinued operations—
Proceeds from sale of LTCHs	0	0	107.9
Other investing activities of discontinued operations	3.3	7.7	(0.7)
Net cash used in investing activities	(226.2)	(178.8)	(24.6)
Cash flows from financing activities:
Principal borrowings on term loan	0	0	100.0
Proceeds from bond issuance	0	275.0	120.0
Principal payments on debt, including pre-payments	(62.5)	(166.2)	(504.9)
Principal borrowings on notes	15.2	0	0
Borrowings on revolving credit facility	197.0	135.0	338.0
Payments on revolving credit facility	(152.0)	(245.0)	(306.0)
Principal payments under capital lease obligations	(10.1)	(12.1)	(13.2)
Repurchase of common stock, including fees and expenses	(234.1)	0	0
Repurchases of convertible perpetual preferred stock, including fees	(2.8)	(46.0)	0
Dividends paid on common stock	(15.7)	0	0
Dividends paid on convertible perpetual preferred stock	(23.0)	(24.6)	(26.0)
Distributions paid to noncontrolling interests of consolidated affiliates	(46.3)	(49.3)	(44.2)
Contributions from consolidated affiliates	1.6	10.5	0
Proceeds from exercising stock warrants	15.3	0	0
Other	5.0	(7.3)	0
Net cash used in financing activities	(312.4)	(130.0)	(336.3)
(Decrease) increase in cash and cash equivalents	(68.3)	102.7	(18.2)
Cash and cash equivalents at beginning of year	132.8	30.1	48.3
Cash and cash equivalents at end of year	64.5	132.8	30.1
Cash (paid) received during the year for-
Interest	(99.4)	(88.1)	(115.4)
Income tax refunds	4.8	2.2	9.6
Income tax payments	(12.5)	(11.8)	(9.1)
Supplemental schedule of noncash financing activities: [Abstract]
Repurchase of preferred stock	320.0	0	0
Convertible debt issued	$ 320.0	$ 0	$ 0