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DEBT - 2030 Senior Notes and Redemption of the 2023 Senior Notes and Redemption of the 2025 Senior Notes (Details) - Senior Notes - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 14, 2020
Jul. 22, 2020
6.00% Senior Notes due 2023          
Debt Instrument [Line Items]          
Redemption amount       $ 83,100,000 $ 266,900,000
Stated interest rate (as a percent)     6.00%   6.00%
Redemption price (as a percent) 100.00%        
5.125% Senior Notes due 2030          
Debt Instrument [Line Items]          
Stated interest rate (as a percent) 5.125%       5.125%
Senior notes issued amount         $ 500,000,000.0
Redemption price (as a percent) 100.00%        
5.875% Senior Notes due 2025          
Debt Instrument [Line Items]          
Redemption amount       $ 103,800,000 $ 333,100,000
Stated interest rate (as a percent)         5.875%
Redemption price (as a percent) 102.938%        
Senior Notes Due 2023 and 2025          
Debt Instrument [Line Items]          
Loss on extinguishment of debt, net   $ 10,200,000      
6.00% Senior Notes Due 2023          
Debt Instrument [Line Items]          
Make-whole premium percentage 0.11%        
Make-whole premium basis percentage 0.50%