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Pension and Other Benefits
 9 Months Ended
Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension and Other Benefits
Pension and Other Benefits
 
 
The following table sets forth the components of net pension and other benefit costs for the three and nine months ended September 30, 2018 and 2017 (in millions):
 
Pension Benefits
Other Benefits
 
2018

2017

2018

2017

Three Months Ended September 30,
 

 

 

 

Service cost
$
1.0

$
1.5

$
—

$
—

Interest cost
8.6

9.3

0.2

0.4

Expected return on plan assets
(8.3
)
(8.6
)
—

—

Amortization of prior service cost
—

—

(0.2
)
(0.3
)
Amortization of actuarial losses
2.6

3.0

—

—

Settlement and curtailment losses
—

—

—

—

NET PERIODIC BENEFIT COST
$
3.9

$
5.2

$
—

$
0.1

Nine Months Ended September 30,
 

 

 

 

Service cost
$
3.2

$
4.5

$
0.1

$
—

Interest cost
25.8

27.8

0.7

0.8

Expected return on plan assets
(25.3
)
(25.6
)
—

—

Amortization of prior service cost
—

—

(0.7
)
(0.7
)
Amortization of actuarial losses
8.1

8.5

0.1

—

Settlement and curtailment losses
—

0.5

—

—

NET PERIODIC BENEFIT COST
$
11.8

$
15.7

$
0.2

$
0.1



In the third quarter of 2018, the Company approved amendments to one of its foreign defined benefit pension plans, which closed the plan to future service accruals effective August 31, 2018. As a result of the amendments, in the third quarter of 2018, the Company recognized a curtailment gain of approximately $5.1 million, net of tax, in Accumulated other comprehensive income. In addition, effective August 31, 2018, the amortization of actuarial gains and losses is being recognized over the remaining life expectancy of the participants of this plan, as all participants are considered inactive as a result of the amendment.

Employer Contributions
 
Although not required by ERISA and the Internal Revenue Code, the Company made a $10.0 million voluntary contribution to its qualified domestic defined benefit pension plan in the third quarter of 2018. The Company anticipates making required contributions of approximately $1.9 million to its foreign pension plans during 2018, of which $1.4 million has been contributed through September 30, 2018.