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Effective Income Tax Rate (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 22.9 | $ 3.7 | $ 1.2 | $ 17.3
Income tax benefit of goodwill impairment loss |  | 85.0 |  |
Foreign Tax Authority [Member] |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | $ 20.0 |  |

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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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