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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.9

 
$
0.8

 
$
2.7

 
$
2.6

Interest cost
 
9.0

 
8.5

 
27.0

 
25.5

Expected asset return
 
(12.1
)
 
(11.5
)
 
(36.3
)
 
(34.5
)
Amortized loss
 
1.3

 
2.2

 
3.9

 
7.0

Amortized prior service cost
 
—

 
4.8

 
—

 
5.4

Net periodic benefit cost (credit)
 
$
(0.9
)
 
$
4.8

 
$
(2.7
)
 
$
6.0

 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions)
 
 
 

 
 

 
 

 
 

Service cost
 
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3

Interest cost
 
3.8

 
3.3

 
11.4

 
9.9

Amortized loss
 
0.2

 
0.2

 
0.6

 
0.6

Amortized prior service credit
 
(0.7
)
 
(0.4
)
 
(2.1
)
 
(1.3
)
Net periodic benefit cost
 
$
3.4

 
$
3.2

 
$
10.2

 
$
9.5