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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three and nine months ended September 30, 2016 and 2015 were as follows:
 
Pension and Other Postretirement Benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(In millions)
2016
 
2015
 
2016
 
2015
Service cost
$
4.8

 
$
2.8

 
$
12.6

 
$
8.5

Interest cost
2.8

 
1.2

 
5.7

 
3.6

Expected return on plan assets
(3.0
)
 
(1.4
)
 
(7.0
)
 
(4.1
)
Plan curtailment, settlement and termination
—

 
0.3

 
—

 
0.8

Amortization of prior service costs
0.1

 
0.1

 
0.2

 
0.2

Recognized net actuarial losses
0.2

 
0.3

 
0.7

 
0.9

Net periodic benefit cost
$
4.9

 
$
3.3

 
$
12.2

 
$
9.9