Interim Financial Statements - Fair Value, Assets Held For Sale, Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Carrying Value	$ 1,571.0	$ 1,571.0		$ 1,852.0
Repayment of debt		$ 550.0	$ 0.0
3.50% senior subordinated notes due 2025
Debt Instrument [Line Items]
Interest rate	3.50%	3.50%		3.50%
Carrying Value	$ 0.0	$ 0.0		$ 549.1
Fair Value	0.0	$ 0.0		$ 543.0
Repayment of debt	$ 550.0
3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Interest rate	3.75%	3.75%		3.75%
Carrying Value	$ 497.1	$ 497.1		$ 496.6
Fair Value	474.2	474.2		451.8
Mortgage facilities
Debt Instrument [Line Items]
Carrying Value	735.1	735.1		474.8
Fair Value	$ 719.0	$ 719.0		$ 450.6