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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three months ended March 31, 2016 and 2015 were as follows:
 
Pension and Other Postretirement Benefits
 
March 31,
(In millions)
2016
 
2015
Service cost
$
3.9

 
$
2.8

Interest cost
1.5

 
1.2

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

 
0.3

Amortization of prior service costs
0.1

 
0.1

Recognized net actuarial losses
0.2

 
0.3

Net periodic benefit cost
$
3.7

 
$
3.3