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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2014
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)
2014
 
2013
Balance at January 1
$
8.4

 
$
6.8

Provisions to expense
8.8

 
10.1

Actual costs incurred
(8.1
)
 
(8.5
)
Balance at December 31
$
9.1

 
$
8.4