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Retirement Plans
 9 Months Ended
Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]  
Retirement Plans

7. Retirement Plans

Components of net pension and other postretirement benefits plan (“OPEB”) income for the three and nine months ended September 30, 2019 and 2018 were as follows:

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

September 30,

 

 

September 30,

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Pension expense (income):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

$

0.2

 

 

$

0.1

 

 

$

0.7

 

 

$

0.5

 

Interest cost

 

8.2

 

 

 

7.7

 

 

 

24.9

 

 

 

23.4

 

Expected return on plan assets

 

(11.5

)

 

 

(12.4

)

 

 

(34.7

)

 

 

(37.6

)

Amortization, net

 

1.6

 

 

 

2.0

 

 

 

4.6

 

 

 

5.9

 

Settlements

 

—

 

 

 

0.2

 

 

 

—

 

 

 

1.5

 

Net pension income

$

(1.5

)

 

$

(2.4

)

 

$

(4.5

)

 

$

(6.3

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPEB expense (income):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

$

—

 

 

$

(0.3

)

 

$

—

 

 

$

0.5

 

Interest cost

 

2.7

 

 

 

2.5

 

 

 

7.7

 

 

 

7.7

 

Expected return on plan assets

 

(3.3

)

 

 

(3.5

)

 

 

(9.9

)

 

 

(10.5

)

Amortization, net

 

(1.9

)

 

 

(0.8

)

 

 

(5.4

)

 

 

(2.2

)

Other

 

—

 

 

 

(5.1

)

 

 

—

 

 

 

(5.1

)

Net OPEB income

$

(2.5

)

 

$

(7.2

)

 

$

(7.6

)

 

$

(9.6

)

 

During the nine months ended September 30, 2019 and 2018, we contributed $5.1 million and $13.5 million, respectively, to our retirement plans.

Other OPEB income during the three and nine months ended September 30, 2018 reflects the change in one of our OPEB liabilities due to a revision to participant demographic data utilized in the actuarial valuations.