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Supplemental Disclosures for Customer Contracts (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Company's Product Warranty Reserve
 
First Quarter
Warranty Reserve (in millions):
2019
 
2018
Balance at beginning of year
$
21.0

 
$
21.1

Accruals for product warranties charged to expense
2.2

 
3.1

Cost of product warranty claims
(2.9
)
 
(2.2
)
Acquisition
0.3

 
—

Balance at end of period
$
20.6

 
$
22.0