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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2012
Employee Benefit Plans [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
 
 
Pension Benefits
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.8

 
$
1.1

 
$
1.6

 
$
2.2

Interest cost
 
8.8

 
9.2

 
17.6

 
18.4

Expected asset return
 
(8.0
)
 
(7.9
)
 
(16.0
)
 
(15.8
)
Amortized loss
 
1.8

 
1.1

 
3.6

 
2.2

Net periodic benefit cost
 
$
3.4

 
$
3.5

 
$
6.8

 
$
7.0

 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(in millions)
 
 
 

 
 

 
 

 
 

Service cost
 
$
0.1

 
$
0.2

 
$
0.2

 
$
0.4

Interest cost
 
3.9

 
4.3

 
7.8

 
8.6

Amortized loss
 
0.2

 
0.1

 
0.4

 
0.2

Amortized prior service credit
 
(0.5
)
 
(0.8
)
 
(1.0
)
 
(1.6
)
Curtailment
 
—

 
—

 
(21.8
)
 
—

Settlement
 
(5.2
)
 
—

 
(5.2
)
 
—

Net periodic benefit cost (credit)
 
$
(1.5
)
 
$
3.8

 
$
(19.6
)
 
$
7.6