Capital Stock and Equity Compensation (Equity 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]
Total equity compensation expense	$ 2.6	$ 4.3	$ 4.3	$ 7.9
Performance-based restricted stock units expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	0.6	2.1	0.6	3.9
Time-based restricted stock units expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	1.5	1.8	2.8	3.5
Deferred stock units expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	0.4	0.1	0.7	0.2
Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	$ 0.1	$ 0.3	$ 0.2	$ 0.3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details