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Pension And Other Retiree Benefits
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension And Other Retiree Benefits
5. Pension and Other Retiree Benefits

The components of net periodic benefit (income) cost for pension and post-retirement plans for the three and six months ended June 30, 2017 and 2016 were as follows: 
 
Three Months Ended June 30,
 
Pension
 
Post-retirement
 
U.S.
 
International
 
 
 
 
(in millions of dollars)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
0.4

 
$
0.3

 
$
0.5

 
$
0.2

 
$
—

 
$
—

Interest cost
1.7

 
1.8

 
3.5

 
2.7

 
0.1

 
0.1

Expected return on plan assets
(3.0
)
 
(3.0
)
 
(5.6
)
 
(4.6
)
 
—

 
—

Amortization of net loss (gain)
0.5

 
0.5

 
0.8

 
0.6

 
(0.1
)
 
(0.1
)
Amortization of prior service cost
0.1

 
0.1

 
—

 
—

 
—

 
—

Net periodic benefit (income) cost
$
(0.3
)
 
$
(0.3
)
 
$
(0.8
)
 
$
(1.1
)
 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
Pension Benefits
 
Post-retirement
 
U.S.
 
International
 
 
 
 
(in millions of dollars)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
0.7

 
$
0.6

 
$
0.8

 
$
0.4

 
$
—

 
$
—

Interest cost
3.5

 
3.6

 
6.4

 
5.4

 
0.1

 
0.2

Expected return on plan assets
(6.1
)
 
(6.0
)
 
(10.5
)
 
(9.2
)
 
—

 
—

Amortization of net loss (gain)
1.0

 
1.0

 
1.5

 
1.2

 
(0.2
)
 
(0.2
)
Amortization of prior service cost
0.2

 
0.2

 
—

 
—

 
—

 
—

Net periodic benefit (income) cost
$
(0.7
)
 
$
(0.6
)
 
$
(1.8
)
 
$
(2.2
)
 
$
(0.1
)
 
$
—


We expect to contribute approximately $19.8 million to our defined benefit plans in 2017, which includes approximately $8.6 million for Esselte defined benefit plans. For the six months ended June 30, 2017, we contributed $10.8 million to these plans.

The Esselte Acquisition added $171.5 million in pension obligations, as of January 31, 2017. The obligations under the acquired German pension plan represent $133.7 million of this amount. German pension law does not require pre-funding of pension obligations and thus the plan is not funded.