Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 16.2	$ 16.4	$ 18.0
Charged to costs and expenses	(3.6)	0.7	0.1
Deductions	0.0	(0.9)	(1.7)
Balance at end of period	12.6	16.2	16.4
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	15.1	15.9	16.0
Charged to costs and expenses	(2.9)	0.0	0.0
Deductions	0.0	(0.8)	(0.1)
Balance at end of period	12.2	15.1	15.9
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	1.1	0.5	2.0
Charged to costs and expenses	(0.7)	0.7	0.1
Deductions	0.0	(0.1)	(1.6)
Balance at end of period	$ 0.4	$ 1.1	$ 0.5