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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Changes in Company's Warranty Liabilities
The following table summarizes the changes in the Company’s warranty liabilities:
(in millions)
2017
 
2016
Balance at January 1
$
6.4

 
$
7.4

Provisions to expense
6.6

 
5.5

Acquisitions
1.7

 
—

Payments
(6.3
)
 
(6.5
)
Balance at December 31
$
8.4

 
$
6.4