II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 26.3	$ 12.1	$ 10.7
Balance Acquired through Acquisitions	0.0	0.0	0.0
Charged to Costs and Expenses	(4.0)	20.1	5.3
Charged to Other Accounts	0.5	0.1	0.1
Deductions	4.3	6.0	4.0
Balance at End of Period	18.5	26.3	12.1
Valuation allowance on deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	0.4	0.4	0.0
Balance Acquired through Acquisitions	0.0	0.0	0.0
Charged to Costs and Expenses	0.0	0.0	0.4
Charged to Other Accounts	0.0	0.0	0.0
Deductions	0.0	0.0	0.0
Balance at End of Period	$ 0.4	$ 0.4	$ 0.4