Interim Financial Statements - Fair Value, Assets Held For Sale, Discontinued Operations (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value of Financial Instruments
Carrying Value	$ 1,486.0	$ 1,474.0
3.50% senior subordinated notes due 2025
Fair Value of Financial Instruments
Interest rate (as a percent)	3.50%
Carrying Value	$ 545.4	544.7
Fair Value	$ 511.8	560.5
3.75% senior subordinated notes due 2029
Fair Value of Financial Instruments
Interest rate (as a percent)	3.75%
Carrying Value	$ 494.7	494.3
Fair Value	413.5	490.7
Mortgage facilities
Fair Value of Financial Instruments
Carrying Value	366.9	353.8
Fair Value	$ 347.2	$ 359.8