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Pension (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost (income)
Components of net periodic benefit cost (income) were as follows:
 
Pension Benefits
 
Three Months Ended
March 31,
(In millions)
2018
 
2017
Service cost
$
0.5

 
$
0.4

Interest cost
2.7

 
2.7

Expected return on plan assets
(4.2
)
 
(4.3
)
Settlement charge
0.1

 
—

Amortization of net actuarial losses
1.6

 
1.3

Net periodic cost
$
0.7

 
$
0.1