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Balance Sheet Information - Warranty Reserves (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Warranty Reserves [Roll Forward]      
Beginning Balance $ 5.2 $ 8.0 $ 8.8
Provision 3.3 0.4 6.8
Usage (4.1) (3.2) (7.6)
Ending Balance $ 4.4 $ 5.2 $ 8.0