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1. Significant Accounting Policies Warranty rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]      
Warranty accrual, beginning of period $ 12.7 $ 9.8 $ 9.0
Provision for warranty 8.8 14.8 9.4
Actual warranty costs (10.9) (11.9) (8.6)
Warranty accrual, end of period $ 10.6 $ 12.7 $ 9.8