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Capital Stock and Equity Compensation (Equity Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	$ 1.7	$ 3.6
Performance-based restricted stock units expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	0.0	1.8
Time-based restricted stock units expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	1.3	1.7
Deferred stock units expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	0.3	0.1
Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	$ 0.1	$ 0.0

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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