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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]  
Summary of Changes in Warranty Liabilities
The following table summarizes the changes in the Company’s warranty liabilities:
 
 
Nine Months Ended 
 September 30,
(in millions)
2013
 
2012
Balance at January 1
$
6.8

 
$
6.7

Provisions to expense
7.2

 
4.7

Payments
(6.4
)
 
(4.6
)
Balance at September 30
$
7.6

 
$
6.8