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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Accounting Policies [Abstract]  
Warranty accrual, beginning of period $ 18.7
Provision for warranty 6.6
Actual warranty costs (8.4)
Warranty accrual, end of period $ 16.9