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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2012
Pensions and Other Postretirement Benefits [Abstract]  
Components of net annual benefit cost (income)
The following table summarizes the components of net annual benefit cost (income) for the three and nine months ended September 30, 2012 and 2011:
(in Millions)
Three Months Ended September 30
 
Nine Months Ended September 30
Pensions
 
Other Benefits
 
Pensions
 
Other Benefits
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Components of net annual benefit cost (income):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
5.1

 
$
4.6

 
$
—

 
$
—

 
$
15.2

 
$
14.4

 
$
0.1

 
$
0.2

Interest cost
15.6

 
15.3

 
0.4

 
0.3

 
46.1

 
46.1

 
1.0

 
1.5

Expected return on plan assets
(19.0
)
 
(20.6
)
 
—

 
—

 
(57.4
)
 
(61.8
)
 
—

 
—

Amortization of prior service cost (credit)
0.4

 
0.5

 
—

 
(0.4
)
 
1.5

 
1.5

 
(0.1
)
 
(0.6
)
Recognized net actuarial and other (gain) loss
11.9

 
8.9

 
(0.8
)
 
(0.5
)
 
38.4

 
27.3

 
(1.8
)
 
(0.7
)
Net periodic benefit cost from continuing operations
$
14.0

 
$
8.7

 
$
(0.4
)
 
$
(0.6
)
 
$
43.8

 
$
27.5

 
$
(0.8
)
 
$
0.4