Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 55.4		$ 63.1		$ (66.0)
Charges to costs and expenses	16.3		10.4		10.7
Reversals to other accounts	(0.2)	[1]	(0.5)	[1]	(0.4)	[1]
Deductions:
Dispositions	(0.4)		0		(0.5)
Uncollectible accounts written off	(12.6)		(16.3)		(11.8)
Foreign currency translation adjustment	0.5		(1.3)		(0.9)
Balance at end of period	$ 59.0		$ 55.4		$ 63.1

[1] Amounts primarily relate to miscellaneous other amounts and reclassifications.