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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]      
Accounts Receivable, Allowance for Credit Loss $ 26.2 $ 22.9 $ 23.9
Current period provisions 21.4 39.8  
Write-offs charged against allowance (25.1) (61.6)  
Recoveries of amounts previously written off $ 7.0 $ 20.8