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Warranties (Tables)
 3 Months Ended
Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Changes in the accruals for warranties
The changes in the accruals for warranties for the three month periods ended March 31, 2013 and 2012 are as follows:

 
Three Months Ended
March 31,
 
2013
 
2012
 
(in millions)
Beginning balance
$
12.5

 
$
13.5

Warranty costs incurred
(1.5
)
 
(2.4
)
Warranty originations and revisions
2.6

 
3.8

Warranty expirations
(1.0
)
 
(0.4
)
Ending balance
$
12.6

 
$
14.5