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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Income tax expense | $ 20.7 | $ 12.9 | $ 36.0 | $ 22.1 |  |
Effective income tax rate, continuing operations | 22.60% | 18.00% | 21.40% | 16.50% |  |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 29.6 |  | $ 29.6 |  |  | $ 48.5
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  | $ 26.1 |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Lower range of expected tax payments related to transfer pricing matters |  |  |  |  | $ 30.0 |
Upper range of expected payments related to transfer pricing matters |  |  |  |  | $ 40.0 |

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