Interim Financial Statements - Fair Value, Assets Held For Sale, Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Carrying Value	$ 1,707.3	$ 1,622.1
3.50% senior subordinated notes due 2025
Debt Instrument [Line Items]
Interest rate	3.50%
Carrying Value	$ 547.3	546.2
Fair Value	$ 518.5	508.7
3.75% senior subordinated notes due 2029
Debt Instrument [Line Items]
Interest rate	3.75%
Carrying Value	$ 495.6	495.1
Fair Value	418.7	404.2
Mortgage facilities
Debt Instrument [Line Items]
Carrying Value	504.5	494.3
Fair Value	$ 472.2	$ 462.1