Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts - 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	$ 7.9	$ 7.0	$ 6.2
Charged to Costs and Expenses	30.9	2.2	2.0
Deductions	(9.2)	(1.3)	(1.2)
Balance at End of Period	$ 29.6	$ 7.9	$ 7.0