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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty accrual, beginning of period $ 9.8 $ 9.0
Provision for warranty 2.7 1.9
Actual warranty costs (2.6) (2.7)
Warranty accrual, end of period $ 9.9 $ 8.2