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Supplemental Disclosures for Customer Contracts (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Company's Product Warranty Reserve
 
Six Months
Warranty Reserve (in millions):
2019
 
2018
Balance at beginning of year
$
21.0

 
$
21.1

Accruals for product warranties charged to expense
5.1

 
4.4

Cost of product warranty claims
(4.6
)
 
(3.9
)
Acquisition
0.3

 
—

Balance at end of period
$
21.8

 
$
21.6