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Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Dec. 31, 2011
Other Comprehensive Income (Loss) [Abstract]  
Schedule of Comprehensive Income (Loss) [Table Text Block]
The components of comprehensive income (loss), net of taxes, are as follows:
 
Year Ended December 31,
 
2011
 
2010
 
2009
 
(in millions)
Net income (loss)
$
75.2

 
$
(2.8
)
 
$
31.4

Other comprehensive income (net of tax):
 
 
 
 
 
Interest rate swap

 
20.5

 
8.5

Temporary decline in available-for-sale securities

 

 
0.1

Total comprehensive income
$
75.2

 
$
17.7

 
$
40.0