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Pension And Other Retiree Benefits
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Pension And Other Retiree Benefits
4. Pension and Other Retiree Benefits

The components of net periodic benefit (income) cost for pension and post-retirement plans for the three months ended March 31, 2016 and 2015 were as follows: 
 
Three Months Ended March 31,
 
Pension Benefits
 
Post-retirement
 
U.S.
 
International
 
 
 
 
(in millions of dollars)
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
0.3

 
$
0.4

 
$
0.2

 
$
0.2

 
$
—

 
$
—

Interest cost
1.8

 
2.2

 
2.7

 
3.2

 
0.1

 
—

Expected return on plan assets
(3.0
)
 
(3.1
)
 
(4.6
)
 
(5.4
)
 
—

 
—

Amortization of net loss (gain)
0.5

 
0.5

 
0.6

 
0.6

 
(0.1
)
 
—

Amortization of prior service cost
0.1

 
0.1

 
—

 
—

 
—

 
—

Curtailment gain
—

 
—

 
—

 
—

 
—

 
(0.2
)
Settlement gain
—

 
—

 
—

 
—

 
—

 
(0.3
)
Net periodic benefit (income) cost
$
(0.3
)
 
$
0.1

 
$
(1.1
)
 
$
(1.4
)
 
$
—

 
$
(0.5
)

We expect to contribute approximately $6.7 million to our defined benefit plans in 2016. For the three months ended March 31, 2016, we have contributed $1.6 million to these plans.