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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
 
Year Ended December 31,
 
2014
 
2013
 
2012
Interest paid
$
25.6

 
$
28.1

 
$
19.4

Income taxes paid
$
3.5

 
$
2.1

 
$
1.8

Non-cash investing and financing activities:
 
 
 
 
 
Stock repurchases not yet settled (accrued in accounts payable)
$
0.8

 
$
1.0

 
$
—

Unpaid purchases of property and equipment
$
1.8

 
$
4.4

 
$
3.4

Purchases of property and equipment through capital leasing arrangements
$
—

 
$
0.2

 
$
0.1