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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 10.7	$ 9.3	$ 32.2	$ 29.0
Total Projected Stock-Based Compensation Expense	32.9		32.9
Equity Option [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8.3	8.0	24.7	25.1
Restricted Stock Units [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2.4	$ 1.3	$ 7.5	$ 3.9

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