Schedule II - Valuation And Qualifying Accounts And Reserves (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 149.2		$ 173.1		$ 161.0
Charged to Costs and Expense	255.1		241.5		248.9
Additions as a Result of Acquisitions	0		0		4.8
Other (Deductions) Additions	(206.7)	[1]	(265.4)	[1]	(241.6)	[1]
Balance at end of year	197.6		149.2		173.1
Valuation allowance-deferred tax assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	11.4		3.9		3.9
Charged to Costs and Expense	3.1		7.7		0
Additions as a Result of Acquisitions	0		0		0
Other (Deductions) Additions	(0.1)	[1]	(0.2)	[1]	0	[1]
Balance at end of year	$ 14.4		$ 11.4		$ 3.9

[1] Other (Deductions) Additions consists primarily of write-offs of accounts receivable amounts.