Income Taxes (Change In The Carrying Amount Of Gross Unrecognized Tax Benefits From Uncertain Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Change in carrying amount of gross unrecognized tax benefits from uncertain tax positions
Balance at January 1	$ 212.0	$ 115.8
Additions for tax positions related to current year	0.0	39.8
Additions for tax positions related to prior years	13.9	65.1
Reductions related to tax positions of current year	(1.1)	0.0
Reductions related to tax positions of prior years	(88.4)	(7.9)
Reductions related to settlements with taxing authorities	(5.3)	(0.8)
Balance at December 31	$ 131.1	$ 212.0

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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