Revenues and Revenue Deductions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012
Health Care Organization, Disclosures for Certain Health Care Entities [Abstract]
Minimum days aged for 100% reserve			365 days
Maximum days aged for standard percentage reserve for uninsured accounts			365 days
Maximum days aged for standard percentage reserve for self-pay after insurance/Medicare accounts			365 days
Allowance for doubtful accounts	$ 382.1		$ 382.1		$ 366.5
Allowance for doubtful accounts as a percentage of accounts receivable			36.40%		34.30%
Allowance for doubtful accounts, uninsured discounts and charity care as a percentage of accounts receivable			100.00%		100.00%
Charity Care [Abstract]
Revenue deduction	61.6	61.3	117.1	111.7
Estimated costs	14.6	16.5	27.8	30.1
Health Care Organization, Third Party Settlements [Abstract]
Change in income from continuing operations due to adjustment for final settlement	(2.4)	4.5	(1.1)	4.9
Change in income from continuing operations due to adjustment for final settlement, net of tax	(1.4)	2.7	(0.7)	3.0
Change in earnings per diluted share due to adjustment for final settlement	$ 0.02	$ 0.03	$ 0.01	$ 0.04
Health Care Organization, Recovery Audit Program [Abstract]
Maximum period from claim date for Recovery Audit			3 years
Increase (decrease) in Recovery Audit Program reserve			(14.5)
Increase (decrease) in Recovery Audit Program reserve, net of taxes			(8.9)
Increase (decrease) in diluted earnings per share due to change in Recovery Audit Program reserve			$ (0.11)
Other accrued expenses and current liabilities [Member]
Health Care Organization, Recovery Audit Program [Abstract]
Recovery Audit Program reserve, current	0.9		0.9		1.9
Other liabilities [Member]
Health Care Organization, Recovery Audit Program [Abstract]
Recovery Audit Program reserve, noncurrent	$ 8.8		$ 8.8		$ 23.8
Minimum [Member]
Charity Care [Abstract]
Percent of federal poverty guidelines			200.00%
Maximum [Member]
Charity Care [Abstract]
Percent of federal poverty guidelines			500.00%