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Write-downs, reserves and recoveries, net (Tables)
 12 Months Ended
Dec. 31, 2011
Write Downs Reserves And Recoveries Net Abstract  
Schedule of Write Downs Reserves And Recoveries Net
Write-downs, reserves and recoveries consist of the following:
 
For the year ended December 31,
 
2011
 
2010
 
2009
 
(in millions)
Loss on disposal of assets, net
$
3.4

 
$
2.6

 
$
1.2

Impairment of assets
0.4

 
0.2

 
—

Legal settlement expense (recoveries)
0.4

 
(6.5
)
 
—

Write-downs, reserves and recoveries, net
$
4.2

 
$
(3.7
)
 
$
1.2