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Discontinued Operations
 6 Months Ended
Jun. 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 six months ended June 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 June 30, 2018
 
Six Months Ended June 30, 2018
Sales
 
$
42.0

 
$
77.6

Cost of sales
 
30.4

 
55.8

Selling, general and administrative expenses
 
7.1

 
14.6

Amortization expense
 
0.6

 
1.2

Operating income (1)
 
3.9

 
6.0

Other loss, net
 
(0.4
)
 
(0.2
)
Income before income taxes
 
3.5

 
5.8

Income tax expense
 
1.1

 
1.8

Income from discontinued operations, net of tax
 
$
2.4

 
$
4.0

_______________
(1) 
Includes depreciation expense of $0.5 and $0.9 for the three and six months ended June 30, 2018, respectively.