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General - Long-Term Debt, Finance Lease and Deferred Financing Obligations - Senior Notes (Details) - Senior Notes - 4.400% Senior Notes due 2024 - USD ($)
$ in Millions
9 Months Ended
Sep. 22, 2017
Sep. 30, 2021
Dec. 31, 2020
Mar. 31, 2020
Debt        
Debt instrument, face amount $ 400.0      
Stated interest rate (as a percent) 4.40%      
Debt instrument, repurchased face amount $ 40.0     $ 28.9
Gain (loss) on repurchase of debt instrument $ 0.7      
Long-term debt   $ 359.7 $ 359.6  
Interest rate during the period (as a percent)   4.90%    
Debt instrument, maturity date   Sep. 22, 2024    
Redemption price of the principal amount redeemed (as a percent)   100.00%