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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		18 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2021
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 9.1	$ (10.9)	$ 18.2	$ (9.8)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					770,500
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures					$ 11.5
Total	94.0		94.0
Equity Option [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8.5	0.0	17.0	0.0
Restricted Stock Units [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0.6	(2.6)	1.2	(1.9)
Restricted Stock [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0.0	$ (8.3)	$ 0.0	$ (7.9)

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