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Pension Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
 
Nine Months Ended September 30,
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Service costs
$
0.7

 
$
0.6

 
$
1.9

 
$
1.7

 
$
—

 
$
—

 
$
—

 
$
—

Interest costs
0.5

 
0.5

 
1.7

 
1.7

 
0.2

 
0.2

 
0.5

 
0.5

Expected return on plan assets
(2.6
)
 
(2.5
)
 
(7.6
)
 
(7.6
)
 
—

 
—

 
—

 
—

Recognized net actuarial loss
—

 
—

 
—

 
—

 
0.2

 
0.1

 
0.5

 
0.4

Net periodic benefit (gains) costs
$
(1.4
)
 
$
(1.4
)
 
$
(4.0
)
 
$
(4.2
)
 
$
0.4

 
$
0.3

 
$
1.0

 
$
0.9