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Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
May 31, 2017
Long-Term Debt                        
Loss on extinguishment of debt $ 0.0 $ 0.0 $ 1.1 $ 0.0 $ 0.2 $ 9.3 $ 7.7 $ 0.0 $ 1.1 $ 17.2 $ 0.0  
Current maturities of long-term debt $ 154.6       $ 288.7       $ 154.6 288.7    
Senior Notes [Member]                        
Long-Term Debt                        
Senior notes face amount                       $ 950.0
Senior notes stated interest rate 5.125%               5.125%     5.125%
Face amount of senior notes repurchased     140.0     $ 600.0            
Loss on extinguishment of debt     $ 0.7             $ 9.5