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Debt and Credit Facilities - Senior Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 26, 2019
Nov. 26, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Loss on debt redemption and refinancing activities     $ 0 $ 16,100,000 $ 1,900,000
Gain on settlement of interest rate swaps     $ (600,000)    
4.00% Senior Notes due December 2027          
Debt Instrument [Line Items]          
Debt principal amount $ 425,000,000 $ 425,000,000      
Debt interest rate 4.00% 4.00% 4.00%    
Extinguishment of debt, amount   $ 425,000,000      
Premium paid on redemption of debt   15,500,000      
Redemption accrued interest recognized   11,500,000      
Loss on debt redemption and refinancing activities   16,100,000      
Accelerated amortization non-lender fees   1,200,000      
Debt issuance costs $ 3,500,000 $ 3,500,000      
Senior Notes due December 2020          
Debt Instrument [Line Items]          
Debt interest rate 6.50% 6.50%      
Extinguishment of debt, amount $ 452,000,000.0 $ 425,000,000