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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

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