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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]      
Accounts Receivable, Allowance for Credit Loss $ 17.7 $ 22.9 $ 23.9
Current period provisions 28.2 39.8  
Write-offs charged against allowance (43.0) (61.6)  
Recoveries of amounts previously written off $ 9.6 $ 20.8