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Pension and Postretirement Benefits
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Pension and Postretirement Benefits Pension and Postretirement Benefits

The components of net periodic benefit (income) costs recognized for the three months and six months ended June 30, 2020 and 2019 were as follows:

 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
(In millions)
Service costs
$
1.1

 
$
0.9

 
$
2.2

 
$
1.8

 
$
—

 
$
—

 
$
—

 
$
—

Interest costs
0.6

 
0.6

 
1.1

 
1.3

 
0.1

 
—

 
0.1

 
0.1

Expected return on plan assets
(2.9
)
 
(2.7
)
 
(5.8
)
 
(5.4
)
 
—

 
—

 
—

 
—

Recognized net actuarial loss
0.5

 
0.5

 
1.0

 
1.1

 
—

 
0.1

 
0.1

 
0.1

Net periodic benefit (income) expense
$
(0.7
)
 
$
(0.7
)
 
$
(1.5
)
 
$
(1.2
)
 
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2