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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.8

 
$
0.7

 
$
2.6

 
$
2.3

Interest cost
 
8.5

 
8.9

 
25.5

 
26.5

Expected asset return
 
(11.5
)
 
(8.0
)
 
(34.5
)
 
(24.0
)
Amortized loss
 
2.2

 
1.9

 
7.0

 
5.5

Amortized prior service cost
 
4.8

 
0.1

 
5.4

 
0.1

Net periodic benefit cost
 
$
4.8

 
$
3.6

 
$
6.0

 
$
10.4

 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
(in millions)
 
 
 

 
 

 
 

 
 

Service cost
 
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3

Interest cost
 
3.3

 
3.8

 
9.9

 
11.6

Amortized loss
 
0.2

 
0.1

 
0.6

 
0.5

Amortized prior service credit
 
(0.4
)
 
(0.3
)
 
(1.3
)
 
(1.3
)
Curtailment gain
 
—

 
—

 
—

 
(21.8
)
Settlement
 
—

 
—

 
—

 
(5.2
)
Net periodic benefit cost (credit)
 
$
3.2

 
$
3.7

 
$
9.5

 
$
(15.9
)