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Pension and Postretirement Benefits
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension and Postretirement Benefits
Pension and Postretirement Benefits

The components of net periodic benefit (income) costs recognized during interim periods were as follows:

 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Service costs
$
0.6

 
$
0.6

 
$
—

 
$
—

Interest costs
0.5

 
0.5

 
0.1

 
0.1

Expected return on plan assets
(2.4
)
 
(2.4
)
 
—

 
—

Recognized net actuarial loss
0.3

 
0.3

 
—

 
0.1

Net periodic benefit (income) costs
$
(1.0
)
 
$
(1.0
)
 
$
0.1

 
$
0.2

Weighted average:
 
 
 
 
 
 
 
Discount rate
3.91
%
 
4.13
%
 
3.63
%
 
3.80
%
Expected return on plan assets
8.25
%
 
8.25
%