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Pension (Tables)
 9 Months Ended
Sep. 30, 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
September 30,
 
Nine Months Ended
September 30,
(In millions)
2018
 
2017
 
2018
 
2017
Service cost
$
0.4

 
$
0.5

 
$
1.4

 
$
1.3

Interest cost
2.7

 
2.7

 
8.1

 
8.1

Expected return on plan assets
(4.4
)
 
(4.3
)
 
(12.9
)
 
(12.9
)
Settlement charge
—

 
—

 
0.4

 
—

Amortization of net actuarial losses
1.7

 
1.3

 
5.0

 
3.9

Net periodic cost
$
0.4

 
$
0.2

 
$
2.0

 
$
0.4