Income Taxes Income Taxes - Rollforward of Deferred Tax Assets Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance, Beginning Balance	$ 123.0	$ 129.8	$ 141.0
Change in assessment	(1.9)	(6.2)	5.6
Current year operations	(12.3)	(0.6)	(16.8)
Deferred Tax Assets, Valuation Allowance, Ending Balance	108.8	123.0	129.8
State and Local Jurisdiction [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance, Beginning Balance	40.4	48.5	57.3
Change in assessment	0.0	0.0	0.0
Current year operations	(4.7)	(8.1)	(8.8)
Deferred Tax Assets, Valuation Allowance, Ending Balance	35.7	40.4	48.5
Foreign Tax Authority [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance, Beginning Balance	82.6	81.3	83.7
Change in assessment	(1.9)	(6.2)	5.6
Current year operations	(7.6)	7.5	(8.0)
Deferred Tax Assets, Valuation Allowance, Ending Balance	$ 73.1	$ 82.6	$ 81.3