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Pension And Other Retiree Benefits
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Pension And Other Retiree Benefits
6. 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, 2018 and 2017 were as follows: 
 
Three Months Ended March 31,
 
Pension
 
Post-retirement
 
U.S.
 
International
 
 
 
 
(in millions of dollars)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
0.4

 
$
0.3

 
$
0.5

 
$
0.3

 
$
—

 
$
—

Interest cost
1.7

 
1.8

 
3.4

 
2.9

 
—

 
—

Expected return on plan assets
(2.9
)
 
(3.1
)
 
(5.9
)
 
(4.9
)
 
—

 
—

Amortization of net loss (gain)
0.6

 
0.5

 
0.9

 
0.7

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

 
0.1

 
—

 
—

 
—

 
—

Net periodic benefit (income) expense(1)
$
(0.1
)
 
$
(0.4
)
 
$
(1.1
)
 
$
(1.0
)
 
$
(0.1
)
 
$
(0.1
)


(1)
The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.

We expect to contribute approximately $20.3 million to our defined benefit plans in 2018. For the three months ended March 31, 2018, we have already contributed $11.3 million to these plans.