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Pensions and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three and six months ended June 30, 2017 and 2016 were as follows:
 
Pension and Other Postretirement Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(In millions)
2017
 
2016
 
2017
 
2016
Service cost
$
5.1

 
$
3.9

 
$
10.1

 
$
7.8

Interest cost
3.8

 
1.5

 
7.5

 
3.0

Expected return on plan assets
(3.6
)
 
(2.0
)
 
(7.1
)
 
(4.0
)
Amortization of prior service costs
—

 
0.1

 
0.1

 
0.2

Recognized net actuarial losses
0.2

 
0.2

 
0.4

 
0.4

Net periodic benefit cost
$
5.5

 
$
3.7

 
$
11.0

 
$
7.4