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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
Components of net periodic benefit cost were as follows:

 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
0.3

 
$
0.4

 
$
0.7

 
$
0.8

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost
2.9

 
3.4

 
5.7

 
6.9

 
—

 
0.1

 
0.1

 
0.2

Expected return on plan assets
(4.5
)
 
(4.8
)
 
(9.0
)
 
(9.6
)
 
—

 
—

 
—

 
—

Amortization of net actuarial (gains) losses
1.0

 
1.2

 
2.1

 
2.3

 
—

 
(0.6
)
 
—

 
(0.7
)
Settlements
—

 
—

 
—

 
0.3

 
—

 
—

 
—

 
—

Net periodic cost (income)
$
(0.3
)
 
$
0.2

 
$
(0.5
)
 
$
0.7

 
$
—

 
$
(0.5
)
 
$
0.1

 
$
(0.5
)