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Restructurings and Lease Terminations (Tables)
 12 Months Ended
Dec. 31, 2011
Restructuring and Related Activities [Abstract]  
Schedule of Accrual and Usage of Restructuring Charges
The following table summarizes the accrual and usage of the restructuring charges (in millions):
 
 
Leases
 
Severance
 
Total
Ending balance, December 31, 2008
$
0.3

 
$
1.4

 
$
1.7

Restructuring charge
—

 
0.5

 
0.5

Cash payments
(0.2
)
 
(1.2
)
 
(1.4
)
Ending balance, December 31, 2009
0.1

 
0.7

 
0.8

Cash payments
(0.1
)
 
(0.4
)
 
(0.5
)
Ending balance, December 31, 2010
—

 
0.3

 
0.3

Restructuring charge
0.7

 
4.2

 
4.9

Cash Payments
(0.1
)
 
(1.2
)
 
(1.3
)
Ending balance, December 31, 2011
$
0.6

 
$
3.3

 
$
3.9

Current portion of accrued restructuring
$
0.1

 
$
3.3

 
$
3.4

Long-term portion of accrued restructuring
$
0.5

 
$
—

 
$
0.5