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1. Basis of Presentation and Use of Estimates Accounts Receivables Allowance for Credit Loss (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Accounts Receivable, Allowance for Credit Loss $ 14.0 $ 15.8 $ 14.9 $ 15.0
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 2.0 1.2    
Allowance for Loan and Lease Losses, Write-offs $ (2.9) $ (0.4)