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Organization and Summary of Significant Accounting Policies - Fair value (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | $ 1,689.6 | $ 2,360.3
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 | $ 543.2 |
Debt instrument, Fair Value | $ 554.6 |
5.50% senior subordinated notes due 2026 |  |
Fair Value of Financial Instruments |  |
Interest rate (as a percent) | 5.50% | 5.50%
Debt instrument, Carrying Value | $ 496.4 | $ 495.7
5.50% senior subordinated notes due 2026 | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | 496.4 | 495.7
Debt instrument, Fair Value | 515.0 | 521.7
Mortgage facilities |  |
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | 458.1 | 423.2
Mortgage facilities | Fair Value, Inputs, Level 2 |  |
Fair Value of Financial Instruments |  |
Debt instrument, Carrying Value | 458.1 | 423.2
Debt instrument, Fair Value | $ 474.7 | $ 430.9

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