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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income tax expense | $ 6.0 | $ 2.0 | $ 3.0 | $ 19.9 |
Effective income tax rate, continuing operations | 10.20% | 1.30% | 3.10% | 7.60% |
Other Tax Expense (Benefit) |  |  | $ (9.3) |  |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 51.3 |  | $ 51.3 |  | $ 45.6
Foreign Tax Authority [Member] |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | $ 20.0 |  |  |

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