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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three and nine months ended September 30, 2019 and 2018 were as follows:
 
Pension and Other Postretirement Benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(In millions)
2019
 
2018
 
2019
 
2018
Service cost
$
5.3

 
$
5.0

 
$
15.9

 
$
15.1

Interest cost
3.8

 
3.6

 
11.5

 
10.9

Expected return on plan assets
(3.0
)
 
(3.6
)
 
(9.1
)
 
(10.9
)
Amortization of prior service costs
0.3

 
0.1

 
0.8

 
0.3

Recognized net actuarial (gains) losses
(0.2
)
 
0.1

 
(0.6
)
 
0.1

Net periodic benefit cost
$
6.2

 
$
5.2

 
$
18.5

 
$
15.5