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Pensions and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three and six months ended June 30, 2016 and 2015 were as follows:
 
Pension and Other Postretirement Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(In millions)
2016
 
2015
 
2016
 
2015
Service cost
$
3.9

 
$
2.8

 
$
7.8

 
$
5.6

Interest cost
1.5

 
1.2

 
3.0

 
2.4

Expected return on plan assets
(2.0
)
 
(1.4
)
 
(4.0
)
 
(2.8
)
Plan curtailment, settlement and termination
—

 
0.3

 
—

 
0.6

Amortization of prior service costs
0.1

 
0.1

 
0.2

 
0.2

Recognized net actuarial losses
0.2

 
0.3

 
0.4

 
0.6

Net periodic benefit cost
$
3.7

 
$
3.3

 
$
7.4

 
$
6.6