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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.9

 
$
0.9

 
$
1.8

 
$
1.8

Interest cost
 
9.0

 
8.5

 
18.0

 
17.0

Expected asset return
 
(12.1
)
 
(11.5
)
 
(24.2
)
 
(23.0
)
Amortized loss
 
1.3

 
2.4

 
2.6

 
4.8

Amortized prior service cost
 
—

 
0.3

 
—

 
0.6

Net periodic benefit cost (credit)
 
$
(0.9
)
 
$
0.6

 
$
(1.8
)
 
$
1.2

 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions)
 
 
 

 
 

 
 

 
 

Service cost
 
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2

Interest cost
 
3.8

 
3.3

 
7.6

 
6.6

Amortized loss
 
0.2

 
0.2

 
0.4

 
0.4

Amortized prior service credit
 
(0.7
)
 
(0.5
)
 
(1.4
)
 
(0.9
)
Net periodic benefit cost
 
$
3.4

 
$
3.1

 
$
6.8

 
$
6.3