Capital Stock and Equity Compensation (Schedule of Equity Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	$ 3.6	$ 3.5
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	1.8	1.3
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	1.7	1.9
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	0.1	0.0
Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity compensation expense	$ 0.0	$ 0.3