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Pensions and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three and six months ended June 30, 2018 and 2017 were as follows:
 
Pension and Other Postretirement Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(In millions)
2018
 
2017
 
2018
 
2017
Service cost
$
5.1

 
$
5.1

 
$
10.1

 
$
10.1

Interest cost
3.7

 
3.8

 
7.3

 
7.5

Expected return on plan assets
(3.7
)
 
(3.6
)
 
(7.3
)
 
(7.1
)
Amortization of prior service costs
0.1

 
—

 
0.2

 
0.1

Recognized net actuarial losses
—

 
0.2

 
0.1

 
0.4

Net periodic benefit cost
$
5.2

 
$
5.5

 
$
10.4

 
$
11.0