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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Employee Benefit Plans [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic benefit cost (credit) are as follows:

 
 
Pension Benefits
 
 
Three Months Ended
 
 
March 31,
 
 
2013
 
2012
 
 
(in millions)
 
 
 
 
 
Service cost
 
$
0.9

 
$
0.8

Interest cost
 
8.5

 
8.8

Expected asset return
 
(11.5
)
 
(8.0
)
Amortized loss
 
2.4

 
1.8

Amortized prior service cost
 
0.3

 
—

Net periodic benefit cost
 
$
0.6

 
$
3.4

 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
 
March 31,
 
 
2013
 
2012
 
 
(in millions)
 
 
 

 
 

Service cost
 
$
0.1

 
$
0.1

Interest cost
 
3.3

 
3.9

Amortized loss
 
0.2

 
0.2

Amortized prior service credit
 
(0.4
)
 
(0.5
)
Curtailment gain
 
—

 
(21.8
)
Net periodic benefit cost (credit)
 
$
3.2

 
$
(18.1
)