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Pension Plans and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit (gains) costs recognized during interim periods were as follows:

 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Service costs
$
0.6

 
$
0.6

 
$

 
$
0.2

Interest costs
0.6

 
0.6

 
0.1

 

Expected return on plan assets
(2.5
)
 
(2.6
)
 

 

Recognized net actuarial loss

 

 
0.2

 
0.1

Net periodic benefit (gains) costs
$
(1.3
)
 
$
(1.4
)
 
$
0.3

 
$
0.3