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1. Basis of Presentation and Use of Estimates Accounts Receivables Allowance for Credit Loss (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Accounts Receivable, Allowance for Credit Loss $ 15.3 $ 15.2 $ 14.9 $ 15.0
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 1.6 0.6    
Allowance for Loan and Lease Losses, Write-offs $ (1.2) $ (0.4)