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1. Significant Accounting Policies Warranty rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]      
Warranty accrual, beginning of period $ 9.0 $ 10.1 $ 18.7
Provision for warranty 9.4 9.9 25.5
Actual warranty costs (8.6) (11.0) (34.1)
Warranty accrual, end of period $ 9.8 $ 9.0 $ 10.1