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Revenue and Credit Losses - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of year $ 51.9 $ 38.5
Additions charged to expense 38.6 27.8
Accounts written-off (7.0) (16.9)
Balance at end of period $ 83.5 $ 49.4