Annual report pursuant to Section 13 and 15(d)

Debt - Unsecured Notes (Details)

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Debt - Unsecured Notes (Details) - USD ($)
Feb. 05, 2021
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2015
Debt Instrument [Line Items]        
Outstanding balance   $ 1,799,246,000 $ 2,272,596,000  
2023 Notes, retired February 2021        
Debt Instrument [Line Items]        
Aggregate principal amount       $ 450,000,000
Outstanding balance $ 450,000,000   $ 450,000,000  
Repayments of debt 450,000,000      
Unsecured Debt | Unsecured Notes, maturing April 2026        
Debt Instrument [Line Items]        
Aggregate principal amount $ 475,000,000      
Interest rate 8.00%      
Percentage of principal allowed to redeem 40.00%      
Redemption price percentage 108.00%