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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 10.6	$ 9.8	$ 21.5	$ 19.7
Total Projected Stock-Based Compensation Expense	42.7		42.7
Equity Option [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8.2	8.6	16.4	17.1
Restricted Stock Units [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2.4	$ 1.2	$ 5.1	$ 2.6

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