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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty accrual, beginning of period $ 7.1 $ 8.4
Provision for warranty 1.8 3.4
Actual warranty costs (2.7) (4.0)
Warranty accrual, end of period $ 6.2 $ 7.8