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Debt - $400 Million 5% Senior Notes (Details) - USD ($)
3 Months Ended
Feb. 17, 2021
Feb. 09, 2021
Mar. 31, 2021
Debt Instrument [Line Items]      
Loss from extinguishment of debt     $ (2,949,000)
$600 Million 4.50% Senior Notes [Member]      
Debt Instrument [Line Items]      
Face amount     $ 600,000,000.0
Senior Notes [Member] | $400 Million 5% Senior Notes [Member]      
Debt Instrument [Line Items]      
Face amount $ 400,000,000 $ 400,000,000  
Stated interest rate (as a percent) 5.00% 5.00% 5.00%
Redemption price of per thousand   $ 1,005.00  
Aggregate tendered amount   $ 161,900,000  
Loss from extinguishment of debt     $ (2,900,000)
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member]      
Debt Instrument [Line Items]      
Face amount $ 600,000,000.0   $ 600,000,000
Stated interest rate (as a percent) 4.50%   4.50%
Redemption price (as a percent) 100.00%    
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | 2030      
Debt Instrument [Line Items]      
Redemption price (as a percent) 102.25%    
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | 2031      
Debt Instrument [Line Items]      
Redemption price (as a percent) 101.50%    
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | 2032      
Debt Instrument [Line Items]      
Redemption price (as a percent) 100.75%    
Senior Notes [Member] | $600 Million 4.50% Senior Notes [Member] | 2033      
Debt Instrument [Line Items]      
Redemption price (as a percent) 100.00%