Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 16.2	$ 9.9	$ 8.3
Charged to Costs and Expenses	34.8	34.9	28.7
Deductions	(29.1)	(28.4)	(27.1)
Charged to Other Accounts	0.0	(0.2)	0.0
Balance at End of Period	21.9	16.2	9.9
Trade receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	14.5	8.3	7.3
Charged to Costs and Expenses	7.6	7.1	3.6
Deductions	(5.6)	(0.7)	(2.6)
Charged to Other Accounts	0.0	(0.2)	0.0
Balance at End of Period	16.5	14.5	8.3
Inventory reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1.7	1.6	1.0
Charged to Costs and Expenses	27.2	27.8	25.1
Deductions	(23.5)	(27.7)	(24.5)
Charged to Other Accounts	0.0	0.0	0.0
Balance at End of Period	$ 5.4	$ 1.7	$ 1.6