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1. Significant Accounting Policies Warranty rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty accrual, beginning of period $ 17.6 $ 17.4
Provision for warranty 29.9 33.4
Actual warranty costs (28.8) (33.2)
Warranty accrual, end of period $ 18.7 $ 17.6