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Allowance for Credit Losses and Doubtful Accounts (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in the allowance for doubtful accounts      
Balance at beginning of period $ 15.8 $ 9.5 $ 7.1
Provision for credit losses 8.6 8.8 3.7
Less net charge-offs (14.5) (2.5) (1.3)
Balance at end of period $ 9.9 $ 15.8 $ 9.5