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1. Basis of Presentation and Use of Estimates Warranty Rollforward (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Accounting Policies [Abstract]  
Warranty accrual, beginning of period $ 10.1
Provision for warranty 4.8
Actual warranty costs (5.4)
Warranty accrual, end of period $ 9.5