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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income tax expense (benefit) | $ (40.4) | $ 11.5 | $ (37.4) | $ 31.4 |
Effective income tax rate, continuing operations | 24.60% | 15.20% | 55.70% | 9.30% |
Income tax benefit of held-for-sale impairment charge | $ 47.2 |  |  |  |
Other Tax Expense (Benefit) |  |  | $ (9.3) |  |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 51.9 |  | $ 51.9 |  | $ 45.6
Foreign Tax Authority [Member] |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | $ 20.0 |

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