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Pension and Other Benefits
 6 Months Ended
Jun. 30, 2016
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 six months ended June 30, 2016 and 2015 (in millions):
 
 
Pension Benefits
Other Benefits
 
2016

2015

2016

2015

Three Months Ended June 30,
 

 

 

 

Service cost
$
3.5

$
4.5

$
—

$
—

Interest cost
10.5

10.1

0.3

0.3

Expected return on plan assets
(11.0
)
(13.4
)
—

—

Amortization of prior service cost
—

—

(0.2
)
(0.3
)
Amortization of actuarial losses/(gains)
3.5

3.0

—

—

NET PERIODIC BENEFIT COST
$
6.5

$
4.2

$
0.1

$
—

Six Months Ended June 30,
 

 

 

 

Service cost
$
7.0

$
9.0

$
—

$
—

Interest cost
21.0

20.2

0.6

0.6

Expected return on plan assets
(22.0
)
(26.6
)
—

—

Amortization of prior service cost
—

—

(0.4
)
(0.5
)
Amortization of actuarial losses/(gains)
7.0

5.9

—

—

NET PERIODIC BENEFIT COST
$
13.0

$
8.5

$
0.2

$
0.1


 
Employer Contributions
 
Although not required by ERISA and the Internal Revenue Code, the Company may elect to make a voluntary contribution to its qualified domestic defined benefit pension plan in 2016. No contributions were required in the prior year, but the Company made a voluntary contribution to its qualified domestic defined benefit pension plan of $20.0 million in January 2015. The Company anticipates making required contributions of approximately $1.9 million to its foreign pension plans during 2016, of which $0.9 million has been contributed through June 30, 2016.