XML 77 R44.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
1. Significant Accounting Policies Warranty rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty accrual, beginning of period $ 10.1 $ 18.7
Provision for warranty 9.9 25.5
Actual warranty costs (11.0) (34.1)
Warranty accrual, end of period $ 9.0 $ 10.1