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1. Significant Accounting Policies Warranty rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty accrual, beginning of period $ 17.8 $ 15.6
Provision for warranty 30.6 28.6
Actual warranty costs (31.0) (26.4)
Warranty accrual, end of period $ 17.4 $ 17.8