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Pension and Postretirement Health and Life Benefits
 6 Months Ended
Jun. 30, 2020
Retirement Benefits, Description [Abstract]  
Pension and Postretirement Health and Life Benefits
PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS

The components of net periodic benefit (credits) for the defined benefit pension plans were as follows (in millions):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2020
 
2019
 
2020
 
2019
Service costs
$
0.9

 
$
0.8

 
$
1.8

 
$
1.6

Interest costs
6.0

 
7.6

 
12.1

 
15.2

Amortization of prior service costs (credits), net
—

 
—

 
(0.1
)
 
—

Expected return on plan assets (gains)
(9.4
)
 
(9.1
)
 
(18.8
)
 
(18.2
)
Net periodic benefit (credits)
$
(2.5
)
 
$
(0.7
)
 
$
(5.0
)
 
$
(1.4
)


The components of net periodic benefit costs for the postretirement health and life benefit plans were as follows (in millions):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2020
 
2019
 
2020
 
2019
Interest costs
$
1.2

 
$
1.5

 
$
2.4

 
$
3.0

Amortization of prior service costs (credits), net
—

 
—

 
—

 
(0.1
)
Net periodic benefit costs
$
1.2

 
$
1.5

 
$
2.4

 
$
2.9



 
The Company reports service costs for its defined benefit pension plans and its postretirement health and life benefit plans in Cost of Sales and Selling, General and Administrative Expenses. The remaining components of net periodic benefit (credits) costs are reported as Nonoperating Components of Net Periodic Benefit Expense (Income).