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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Employee Benefit Plans [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
 
 
Pension Benefits
 
 
Three Months Ended
 
 
March 31,
 
 
2012
 
2011
 
 
(in millions)
 
 
 
 
 
Service cost
 
$
0.8

 
$
1.1

Interest cost
 
8.8

 
9.2

Expected asset return
 
(8.0
)
 
(7.9
)
Amortized loss
 
1.8

 
1.1

Net periodic benefit cost
 
$
3.4

 
$
3.5

 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
 
March 31,
 
 
2012
 
2011
 
 
(in millions)
 
 
 

 
 

Service cost
 
$
0.1

 
$
0.2

Interest cost
 
3.9

 
4.3

Amortized loss
 
0.2

 
0.1

Amortized prior service credit
 
(0.5
)
 
(0.8
)
Curtailment gain
 
(21.8
)
 
—

Net periodic benefit cost (credit)
 
$
(18.1
)
 
$
3.8