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Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Trade Accounts Receivable      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period $ 1.6 $ 1.8 $ 2.5
Charged to Income 1.3 1.9 1.2
Other Charges 0.0 0.0 0.0
Deductions from Reserves 1.3 2.1 1.9
Balance at End of Period 1.6 1.6 1.8
Deferred Tax Assets      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period 60.2 69.0 69.9
Charged to Income (2.2) (8.8) (0.9)
Other Charges 0.0 0.0 0.0
Deductions from Reserves 0.0 0.0 0.0
Balance at End of Period $ 58.0 $ 60.2 $ 69.0