Interim Financial Statements - Fair Value, Assets Held For Sale, Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Carrying Value	$ 1,878.0	$ 1,629.2
3.50% senior subordinated notes due 2025
Debt Instrument [Line Items]
Interest rate	3.50%	3.50%
Carrying Value	$ 548.8	$ 547.7
Fair Value	$ 540.0	$ 529.7
3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Interest rate	3.75%	3.75%
Carrying Value	$ 496.4	$ 495.8
Fair Value	463.1	444.4
Mortgage facilities
Debt Instrument [Line Items]
Carrying Value	570.4	402.1
Fair Value	$ 550.5	$ 378.5