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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty accrual, beginning of period $ 8.4 $ 10.6
Provision for warranty 1.4 2.0
Actual warranty costs (2.3) (2.7)
Warranty accrual, end of period $ 7.5 $ 9.9