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Redeemable Preferred Stock - Additional Information (Details)
 12 Months Ended
Aug. 31, 2017
USD ($)
trading_day
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Temporary Equity [Line Items]      
Preferred stock, par value (in USD per share) | $ / shares   $ 0.01 $ 0.01
Dividends declared but unpaid | $   $ 0 $ 0
Cumulative preferred dividends | $   $ 109,000,000.0 $ 69,500,000
Cumulative preferred dividends (in USD per share) | $ / shares   $ 351.54 $ 224.09
Increase (Decrease) in Temporary Equity [Roll Forward]      
Balance at beginning of period | $   $ 395,000,000.0 $ 359,300,000
Dividends accrued (there were no cash dividends declared) | $   39,500,000 35,700,000
Cash dividends declared | $   0 0
Balance at end of period | $   $ 434,500,000 $ 395,000,000.0
Series A Preferred Stock      
Temporary Equity [Line Items]      
Preferred stock dividend rate 10.00%    
Trading days | trading_day 20    
Consecutive trading days | trading_day 30    
Threshold share price (in USD per share) | $ / shares $ 42.00    
Maximum cash dividend declarable 50.00%    
Redemption price (in USD per share) | $ / shares $ 1,000.00    
Series A Preferred Stock | Common Stock      
Temporary Equity [Line Items]      
Share price (in USD per share) | $ / shares $ 19.00    
Majority Shareholder | Series A Preferred Stock      
Temporary Equity [Line Items]      
Stock issued during period (shares) | shares 310,000    
Preferred stock, par value (in USD per share) | $ / shares $ 0.01    
Purchase price per share (in USD per share) | $ / shares $ 1,000    
Initial public offering | $ $ 310,000,000.0