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Discontinued Operations | 9 Months Ended
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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.

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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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