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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2013
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 months ended March 31, 2013 and 2012:
(in Millions)
Three Months Ended March 31
Pensions
 
Other Benefits
2013
 
2012
 
2013
 
2012
Components of net annual benefit cost (income):
 
 
 
 
 
 
 
Service cost
$
5.4

 
$
5.1

 
$
—

 
$
—

Interest cost
14.5

 
15.3

 
0.3

 
0.3

Expected return on plan assets
(19.2
)
 
(19.2
)
 
—

 
—

Amortization of prior service cost (credit)
0.5

 
0.5

 
—

 
—

Recognized net actuarial and other (gain) loss
17.5

 
13.2

 
(0.4
)
 
(0.5
)
Net periodic benefit cost from continuing operations
$
18.7

 
$
14.9

 
$
(0.1
)
 
$
(0.2
)