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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
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,
 
 
2015
 
2014
 
 
(in millions)
 
 
 
 
 
Service cost
 
$
0.8

 
$
0.9

Interest cost
 
7.2

 
9.0

Expected asset return
 
(10.6
)
 
(12.1
)
Amortized loss
 
1.7

 
1.3

Net periodic benefit credit
 
$
(0.9
)
 
$
(0.9
)
 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
 
March 31,
 
 
2015
 
2014
 
 
(in millions)
 
 
 

 
 

Service cost
 
$
0.1

 
$
0.1

Interest cost
 
3.8

 
3.8

Amortized loss
 
0.2

 
0.2

Amortized prior service credit
 
(0.7
)
 
(0.7
)
Net periodic benefit cost
 
$
3.4

 
$
3.4