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1. Basis of Presentation and Use of Estimates Accounts Receivables Allowance for Credit Loss (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Accounts Receivable, Allowance for Credit Loss $ 15.0 $ 19.4 $ 19.8 $ 20.2
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 0.6 1.2    
Allowance for Loan and Lease Losses, Write-offs (5.6) (2.1)    
Accounts Receivable, Allowance for Credit Loss, Recovery $ 0.2 $ 0.1