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Basis Of Presentation Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Adoption of New Accounting Standards [Abstract]
Deferred Tax Assets, Other	$ 11.0
Deferred Tax Liabilities, Other	36.9
Adjustments to Additional Paid in Capital, Other	2.5
adjustments to accumulated deficit	45.4
Deferred Tax Asset for previously unrecognized excess tax benefits	47.9
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition	$ 2.5
excess tax benefit related to stock based compensation		$ 12.7

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907

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adjustments to accumulated deficit related to the adoption of ASU 2016-09

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Adoption of New Accounting Standards [Abstract]

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