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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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8.7	$ 12.7	$ 20.0	$ 25.6
Restricted Stock Units [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8.7	11.3	19.5	21.9
Equity Option [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0.0	$ 1.4	$ 0.5	$ 3.7

X

- Definition

Amount of noncash expense for share-based payment arrangement.

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