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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]      
Accounts Receivable, Allowance for Credit Loss $ 18.6 $ 23.7 $ 22.9
Current period provisions 36.4 38.8  
Write-offs charged against allowance (48.9) (55.7)  
Recoveries of amounts previously written off $ 7.4 $ 17.7