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Pension (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Components of net periodic benefit cost (income)

Components of net periodic benefit cost were as follows:
 
Three Months Ended
June 30,
 
Six Months Ended June 30,
(In millions)
2020
 
2019
 
2020
 
2019
Service cost
$
0.6

 
$
0.5

 
$
1.1

 
$
0.9

Interest cost
2.3

 
2.9

 
4.6

 
5.5

Expected return on plan assets
(3.3
)
 
(3.8
)
 
(6.6
)
 
(7.6
)
Amortization of net actuarial losses
2.0

 
1.4

 
4.0

 
3.1

Net periodic cost
$
1.6

 
$
1.0

 
$
3.1

 
$
1.9