Income Taxes - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 07, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Income taxes paid	$ 3.3	$ 122.1	$ 29.9	$ 57.4
Income taxes refunded	0.1	1.2	0.5	2.3
Federal, state and local, and foreign tax loss carryforwards		63.2	68.4
Federal, state and local, and foreign tax loss carryforwards not subject to expiration		28.3
Federal, state and local, and foreign tax loss carryforwards subject to expiration		34.9
Valuation allowances		35.8	33.1
Unrecognized tax benefits	14.3	18.9	17.1	5.4	$ 7.7
Unrecognized tax benefits that would impact effective tax rate		18.3
Interest expense related to unrecognized tax benefits	$ 0.1	0.6	0.3	$ 0.2
Accrued interest related to unrecognized tax benefits		0.7	0.3
Net Operating Losses and Capital Loss Carryforwards
Income Tax Contingency [Line Items]
Valuation allowances		35.2	32.8
Foreign Tax Authority
Income Tax Contingency [Line Items]
Capital loss carryforwards		$ 10.0	$ 8.7