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Discontinued Operations | 6 Months Ended
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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.

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- Definition The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2122178 + Details
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