Valuation and Qualifying Accounts and Reserves (Schedule II) (Details) - Deferred Tax Asset Valuation Allowance - 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]
Beginning balance	$ 104.6	$ 84.6	$ 73.5
Additions (deductions)	(7.4)	20.0	7.4
Acquired balances	0.0	0.0	3.7
Ending balance	$ 97.2	$ 104.6	$ 84.6