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Pension and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Benefit Expense
Net periodic pension expense for the three months ended March 31, 2018 and 2017 is presented below:
 
 
Three Months Ended
March 31, 2018
 
Three Months Ended
March 31, 2017
 
 
Total
 
U.S.
Plans
 
International
Plans
 
Total
 
U.S.
Plans
 
International
Plans
Service cost(i)
 
$
0.8

 
$
—

 
$
0.8

 
$
1.6

 
$
—

 
$
1.6

Interest cost
 
64.0

 
46.6

 
17.4

 
69.9

 
52.5

 
17.4

Expected return on plan assets
 
(87.2
)
 
(57.6
)
 
(29.6
)
 
(89.4
)
 
(58.8
)
 
(30.6
)
Amortization of prior service benefit
 
(1.5
)
 
(0.6
)
 
(0.9
)
 
(1.3
)
 
(0.6
)
 
(0.7
)
Recognized net actuarial loss
 
42.1

 
31.2

 
10.9

 
43.7

 
30.9

 
12.8

Net periodic pension expense (benefit)
 
$
18.2

 
$
19.6

 
$
(1.4
)
 
$
24.5

 
$
24.0

 
$
0.5

(i) 
Service cost is reported in cost of revenue - services and selling, general and administrative expenses. All other components of net periodic pension expense are reported in other income (expense), net in the Consolidated Statements of Income.
Other Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Benefit Expense
Net periodic postretirement benefit expense for the three months ended March 31, 2018 and 2017 is presented below:
 
 
Three Months Ended
March 31,
 
 
2018
 
2017
Service cost(i)
 
$
0.2

 
$
0.1

Interest cost
 
1.2

 
1.5

Expected return on assets
 
(0.1
)
 
(0.1
)
Recognized net actuarial loss
 
0.3

 
0.3

Amortization of prior service benefit
 
(0.5
)
 
(0.1
)
Net periodic postretirement benefit expense
 
$
1.1

 
$
1.7

(i) 
Service cost is reported in selling, general and administrative expenses. All other components of net periodic postretirement benefit expense are reported in other income (expense), net in the Consolidated Statements of Income.