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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three months ended March 31, 2019 and 2018 were as follows:
 
Pension and Other Postretirement Benefits
 
Three Months Ended
 
March 31,
(In millions)
2019
 
2018
Service cost
$
5.3

 
$
5.0

Interest cost
3.8

 
3.6

Expected return on plan assets
(3.0
)
 
(3.6
)
Amortization of prior service costs
0.3

 
0.1

Recognized net actuarial gains
(0.2
)
 
—

Net periodic benefit cost
$
6.2

 
$
5.1