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Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement [Abstract] |  |  |  |
Tax expense (benefit) on gain (loss) from discontinued operations and disposal | $ 0.0 | $ (1.0) | $ 0.0 | $ 3.1

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