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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty accrual, beginning of period $ 8.4 $ 10.6
Provision for warranty 3.4 4.2
Actual warranty costs (4.0) (5.8)
Warranty accrual, end of period $ 7.8 $ 9.0