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Warranty Reserve (Tables)
 3 Months Ended
Apr. 02, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Company's Product Warranty Reserve
 
First Quarter
Warranty Reserve (in millions):
2017
 
2016
Balance at beginning of year
$
18.4

 
$
17.1

Accruals for product warranties charged to expense
1.8

 
1.9

Cost of product warranty claims
(1.6
)
 
(1.6
)
Acquisition - e2v
3.0

 
—

Balance at end of period
$
21.6

 
$
17.4