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Discontinued Operations
 9 Months Ended
Sep. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued Operations Discontinued Operations
On December 20, 2018, we closed the sale of our oxygen-related products business to NGK SPARK PLUG CO., LTD. (the “Divestiture”). As a result of the Divestiture, the asset group, which included our respiratory and on-site generation systems businesses, qualified for discontinued operations for the three and nine months ended September 30, 2018. As such, the financial results of the respiratory therapy and on-site generation systems businesses are reflected in our unaudited condensed consolidated statements of income and comprehensive income as discontinued operations for the prior-year periods presented.
Summarized Financial Information of Discontinued Operations
The following table represents income from discontinued operations, net of tax:
 
Three Months Ended September 30, 2018
 
Nine Months Ended September 30, 2018
Sales
$
43.0

 
$
120.6

Cost of sales
31.3

 
87.1

Selling, general and administrative expenses
6.8

 
21.4

Amortization expense
0.6

 
1.8

Operating income (1)
4.3

 
10.3

Other loss, net
0.4

 
0.6

Income before income taxes
3.9

 
9.7

Income tax expense
3.2

 
5.0

Income from discontinued operations, net of tax
$
0.7

 
$
4.7

_______________
(1) 
Includes depreciation expense of $0.4 and $1.3 for the three and nine months ended September 30, 2018, respectively.