Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 64.9		$ 59.0		$ 55.4
Charges to costs and expenses	7.4		12.6		16.3
Reversals to other accounts	0.1	[1]	0.7	[1]	(0.2)	[1]
Deductions:
Dispositions	0		0		(0.4)
Uncollectible accounts written off	(8.1)		(7.2)		(12.6)
Foreign currency translation adjustment	(4.8)		(0.2)		0.5
Balance at end of period	$ 59.5		$ 64.9		$ 59.0

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