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Discontinued Operations | 3 Months Ended
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Mar. 31, 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 months ended March 31, 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 period presented. Summarized Financial Information of Discontinued Operations The following table represents income from discontinued operations, net of tax:
| Three Months Ended March 31, 2018
Sales | $ | 35.6 |
Cost of sales | 25.4 |
Selling, general and administrative expenses | 7.5 |
Amortization expense | 0.6 |
Operating income (1) | 2.1 |
Other income, net | 0.2 |
Income before income taxes | 2.3 |
Income tax expense | 0.7 |
Income from discontinued operations, net of tax | $ | 1.6 |
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(1) | Includes depreciation expense of $0.4 for the three months ended March 31, 2018.

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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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