Capital Stock - Schedule of Share-based Compensation Expense, by Expense Category (Details) - Continuing Operations - 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 share-based compensation expense	$ 17.0	$ 7.4	$ 20.2	$ 11.7
Location, Statement of Income, Balance [Axis]: us-gaap:DirectOperatingCosts
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total share-based compensation expense	3.4	0.9	3.9	1.7
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total share-based compensation expense	13.5	4.3	16.2	7.6
Location, Statement of Income, Balance [Axis]: us-gaap:RestructuringCharges
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total share-based compensation expense	$ 0.1	$ 2.2	$ 0.1	$ 2.4