Income Taxes (Schedule of Income Taxes Paid Net of Refunds Received) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Paid, by Individual Jurisdiction [Line Items]
Federal (Canada)	$ 51.8	$ 29.0	$ 45.9
Income taxes paid, net of refunds received	227.0	201.0	180.0
British Columbia
Income Tax Paid, by Individual Jurisdiction [Line Items]
Provincial and local (Canada):	23.9	10.5	16.4
Other provincial and local
Income Tax Paid, by Individual Jurisdiction [Line Items]
Provincial and local (Canada):	16.3	11.6	18.8
United States federal
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign:	101.0	116.2	77.1
Other foreign
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign:	$ 34.0	$ 33.7	$ 21.8