Organization and Summary of Significant Accounting Policies - Fair value (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value of Financial Instruments
Debt instrument, Carrying Value	$ 1,474.0	$ 1,689.6
3.50% senior subordinated notes due 2025
Fair Value of Financial Instruments
Interest rate (as a percent)	3.50%	3.50%
3.50% senior subordinated notes due 2025 | Fair Value, Inputs, Level 2
Fair Value of Financial Instruments
Debt instrument, Carrying Value	$ 544.7	$ 543.2
Debt instrument, Fair Value	$ 560.5	$ 554.6
3.75% senior subordinated notes due 2029
Fair Value of Financial Instruments
Interest rate (as a percent)	3.75%	3.75%
Debt instrument, Carrying Value	$ 494.3	$ 0.0
3.75% senior subordinated notes due 2029 | Fair Value, Inputs, Level 2
Fair Value of Financial Instruments
Debt instrument, Carrying Value	494.3	0.0
Debt instrument, Fair Value	490.7	0.0
Mortgage facilities
Fair Value of Financial Instruments
Debt instrument, Carrying Value	353.8	458.1
Mortgage facilities | Fair Value, Inputs, Level 2
Fair Value of Financial Instruments
Debt instrument, Carrying Value	353.8	458.1
Debt instrument, Fair Value	$ 359.8	$ 474.7