Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards
Operating loss carryforwards, state and local	$ 352.0	$ 352.0
Operating loss carryforwards, foreign	288.0	288.0
Tax credit carryforwards	8.0	8.0
Carryforwards expiring in 2021	41.9	41.9
Tax credit carryforwards expiring between 2022 and 2040	310.7	310.7
Decrease in valuation allowance		2.2	$ 1.6
Income taxes on gain from sale of business	2.0
Undistributed earnings of foreign subsidiaries	172.0	172.0
Unrecognized tax benefit	7.1	7.1	13.6	$ 17.2	$ 20.3
Net unrecognized tax benefits	6.4	6.4	11.0	13.9
Gross accrued interest	2.6	2.6	3.8	4.1
Net accrued interest	2.2	2.2	3.0	3.2
Gross interest income included in income tax (provision) benefit		1.0	0.2	(0.5)
Penalties excluded	0.0	0.0	0.0	0.0
Income tax benefits related to various valuation allowance adjustments, primarily due to foreign tax credits for which the future realization is considered likely		4.3
Excess tax benefit, revaluation of deferred tax liabilities		3.5
Expense associated with global, intangible low-taxed income		13.2
Tax benefit related to various audit settlements, statute expirations, and other adjustments			4.2	1.2
Excess tax benefits from stock-based compensation awards vested during the year			$ 2.8	1.6
Tax credit				$ 1.3
Uncertain tax positions and interest with various refund claims period		2.2
Deferral totaling amount	3.5	3.5
Maximum
Operating Loss Carryforwards
Uncertain tax positions and interest with various refund claims period	$ 5.0	$ 5.0