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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

Income tax benefit of goodwill impairment loss

+ References

No definition available.

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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

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