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Balance Sheet Information - Warranty Reserves (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Warranty Reserves    
Beginning Balance $ 8.0 $ 8.8
Provision (0.9) 5.9
Usage (1.6) (6.9)
Ending Balance $ 5.5 $ 7.8