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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty accrual, beginning of period $ 10.6 $ 12.7
Provision for warranty 2.0 2.2
Actual warranty costs (2.7) (2.7)
Warranty accrual, end of period $ 9.9 $ 12.2