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Warranty Reserve (Tables)
 9 Months Ended
Oct. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Company's Product Warranty Reserve
 
Nine Months
Warranty Reserve (in millions):
2017
 
2016
Balance at beginning of year
$
18.4

 
$
17.1

Accruals for product warranties charged to expense
4.8

 
7.0

Cost of product warranty claims
(5.3
)
 
(4.7
)
Acquisitions
3.1

 
0.3

Balance at end of period
$
21.0

 
$
19.7