Balance Sheet Information - Warranty Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Warranty Reserves    
Beginning Balance $ 8.0 $ 8.8
Provision (0.4) 0.8
Usage (0.2) (1.8)
Ending Balance $ 7.4 $ 7.8