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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