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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty accrual, beginning of period $ 12.7 $ 9.8
Provision for warranty 2.2 2.7
Actual warranty costs (2.7) (2.6)
Warranty accrual, end of period $ 12.2 $ 9.9