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Discontinued Operations Discontinued Operations Income Statement (Tables) | 6 Months Ended
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Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Disposal Groups, Including Discontinued Operations [Table Text Block] | The following is a summary of operating results included in income (loss) from discontinued operations for the three and six months ended June 30, 2019 and 2018:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
|  | (in millions)
Revenues |  | $ | — |  |  | $ | 320.3 |  |  | $ | — |  |  | $ | 631.2 |
Cost of revenues |  | — |  |  | 248.0 |  |  | 0.1 |  |  | 490.9 |
Selling, engineering, and administrative expenses |  | 1.1 |  |  | 34.9 |  |  | 2.3 |  |  | 66.4 |
Other expense |  | — |  |  | 1.1 |  |  | — |  |  | 2.1 |
Income (loss) from discontinued operations before income taxes |  | (1.1 | ) |  | 36.3 |  |  | (2.4 | ) |  | 71.8 |
Provision (benefit) for income taxes |  | (0.3 | ) |  | 8.1 |  |  | (0.5 | ) |  | 17.2 |
Income (loss) from discontinued operations, net of income taxes |  | $ | (0.8 | ) |  | $ | 28.2 |  |  | $ | (1.9 | ) |  | $ | 54.6 |

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