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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2011
Supplemental Cash Flow Elements [Abstract]  
Supplemental cash flow information
 
 
Year Ended December 31,
 
 
2011
 
2010
 
2009
Supplemental disclosure of cash flow information:
 
 
 
 
 
 
Interest paid
 
$
10.4

 
$
6.0

 
$
2.0

Income taxes paid
 
$
3.5

 
$
0.8

 
$
12.8

Supplemental disclosure of non-cash transactions:
 
 
 
 
 
 
Non-cash capital expenditures
 
$
1.8

 
$
1.7

 
$
5.3

Issuance of Nichols Promissory Note — Note 4
 
$
—

 
$
6.7

 
$
—

Capital leases acquired
 
$
0.3

 
$
—

 
$
—