Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 59.5	$ 64.9	$ 59.0
Charges to costs and expenses		11.4	7.4	12.6
Reversals to other accounts	[1]	(0.4)	0.1	0.7
Deductions:
Dispositions		(2.4)	0.0	0.0
Uncollectible accounts written off		(9.8)	(8.1)	(7.2)
Foreign currency translation adjustment		(4.1)	(4.8)	(0.2)
Balance at end of period		$ 54.2	$ 59.5	$ 64.9

[1] Amounts primarily represent miscellaneous reclassifications and allowances of acquired companies.