Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 11.6	$ 11.4	$ 10.2
Charged to Costs and Expenses	22.9	19.9	18.6
Deductions	(26.8)	(19.8)	(17.3)
Charged to Other Accounts	0.2	0.1	(0.1)
Balance at End of Period	7.9	11.6	11.4
Trade receivables
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	10.9	10.8	9.4
Charged to Costs and Expenses	2.0	1.3	2.2
Deductions	(6.0)	(1.3)	(0.7)
Charged to Other Accounts	0.2	0.1	(0.1)
Balance at End of Period	7.1	10.9	10.8
Inventory reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	0.7	0.6	0.8
Charged to Costs and Expenses	20.9	18.6	16.4
Deductions	(20.8)	(18.5)	(16.6)
Charged to Other Accounts	0.0	0.0	0.0
Balance at End of Period	$ 0.8	$ 0.7	$ 0.6