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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
Employee Benefit Plans [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
 
 
Pension Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.7

 
$
1.2

 
$
2.3

 
$
3.4

Interest cost
 
8.9

 
9.2

 
26.5

 
27.6

Expected asset return
 
(8.0
)
 
(7.9
)
 
(24.0
)
 
(23.7
)
Amortized loss
 
1.9

 
1.1

 
5.5

 
3.3

Amortized prior service cost
 
0.1

 
—

 
0.1

 
—

Net periodic benefit cost
 
$
3.6

 
$
3.6

 
$
10.4

 
$
10.6

 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(in millions)
 
 
 

 
 

 
 

 
 

Service cost
 
$
0.1

 
$
0.2

 
$
0.3

 
$
0.6

Interest cost
 
3.8

 
4.3

 
11.6

 
12.9

Amortized loss
 
0.1

 
0.1

 
0.5

 
0.3

Amortized prior service credit
 
(0.3
)
 
(0.8
)
 
(1.3
)
 
(2.4
)
Curtailment gain
 
—

 
—

 
(21.8
)
 
—

Settlement
 
—

 
—

 
(5.2
)
 
—

Net periodic benefit cost (credit)
 
$
3.7

 
$
3.8

 
$
(15.9
)
 
$
11.4