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Other-Net, (Income) Expense
 12 Months Ended
Dec. 31, 2019
Nonoperating Income (Expense) [Abstract]  
Other-Net, (Income) Expense  Other–Net, (Income) Expense
Other–net, (income) expense consisted of the following:
 
2019
 
2018
 
2017
Interest expense
$
400.6

 
$
242.5

 
$
225.0

Interest income
(80.4
)
 
(159.3
)
 
(166.4
)
Debt extinguishment loss (Note 11)
252.5

 
—

 
—

Gain on sale of antibiotic business in China (Note 3)
(309.8
)
 
—

 
—

Retirement benefit
(209.9
)
 
(240.5
)
 
(249.0
)
Other (income) expense
(344.6
)
 
11.7

 
(111.1
)
Other–net, (income) expense
$
(291.6
)
 
$
(145.6
)
 
$
(301.5
)

For the years ended December 31, 2019 and 2017, other income was primarily related to net gains on investments (Note 7).