Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 63.1		$ 66.0		$ (63.9)
Charges to costs and expenses	10.4		10.7		19.3
Reversals to other accounts	(0.5)	[1]	(0.4)	[1]	(2.8)	[1]
Deductions:
Dispositions	0		(0.5)		(0.2)
Uncollectible accounts written off	(16.3)		(11.8)		(16.5)
Foreign currency translation adjustment	(1.3)		(0.9)		2.3
Balance at end of period	$ 55.4		$ 63.1		$ 66.0

[1] Amounts relate to allowance for doubtful accounts of acquired and newly consolidated companies, miscellaneous other amounts and reclassifications.