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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty accrual, beginning of period $ 9.8 $ 9.0
Provision for warranty 8.7 5.4
Actual warranty costs (8.3) (6.1)
Warranty accrual, end of period $ 10.2 $ 8.3