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Pension and Post-retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]  
Components of net periodic benefit cost
The components of net periodic benefit cost were as follows (in millions):

 
For the Three Months Ended March 31,
 
2013
 
2012
 
2013
 
2012
 
Pension Benefits
 
Other Benefits
Service cost
$
1.3

 
$
1.4

 
$
—

 
$
0.3

Interest cost
4.1

 
4.3

 
0.1

 
0.2

Expected return on plan assets
(5.2
)
 
(4.7
)
 
—

 
—

Amortization of prior service cost
0.1

 
0.1

 
(0.8
)
 
(0.5
)
Recognized actuarial loss
2.4

 
2.2

 
0.4

 
0.3

Settlements and curtailments
0.5

 
—

 


 


Net periodic benefit cost(1)
$
3.2

 
$
3.3

 
$
(0.3
)
 
$
0.3


(1) All net periodic benefit cost for the three months ended March 31, 2013 and 2012 related to continuing operations.