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Pension And Other Retiree Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost for Pension and Post-Retirement Plans
The components of net periodic benefit (income) cost for pension and post-retirement plans for the three and six months ended June 30, 2018 and 2017 were as follows: 
 
Three Months Ended June 30,
 
Pension
 
Post-retirement
 
U.S.
 
International
 
 
 
 
(in millions of dollars)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
0.4

 
$
0.4

 
$
0.5

 
$
0.5

 
$
—

 
$
—

Interest cost
1.7

 
1.7

 
3.3

 
3.5

 
—

 
0.1

Expected return on plan assets
(3.0
)
 
(3.0
)
 
(5.8
)
 
(5.6
)
 
—

 
—

Amortization of net loss (gain)
0.7

 
0.5

 
0.9

 
0.8

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

 
0.1

 
—

 
—

 
—

 
—

Net periodic benefit income(1)
$
(0.1
)
 
$
(0.3
)
 
$
(1.1
)
 
$
(0.8
)
 
$
(0.1
)
 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
Pension
 
Post-retirement
 
U.S.
 
International
 
 
 
 
(in millions of dollars)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
0.8

 
$
0.7

 
$
1.0

 
$
0.8

 
$
—

 
$
—

Interest cost
3.4

 
3.5

 
6.7

 
6.4

 
—

 
0.1

Expected return on plan assets
(5.9
)
 
(6.1
)
 
(11.7
)
 
(10.5
)
 
—

 
—

Amortization of net loss (gain)
1.3

 
1.0

 
1.8

 
1.5

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

 
0.2

 
—

 
—

 
—

 
—

Net periodic benefit income(1)
$
(0.2
)
 
$
(0.7
)
 
$
(2.2
)
 
$
(1.8
)
 
$
(0.2
)
 
$
(0.1
)


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