Income Taxes (Unrecognized benefits) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits	$ 853.4	$ 1,066.6	$ 1,338.8
Additions based on tax positions related to the current year	133.8	73.4	131.3
Additions for tax positions of prior years	97.5	14.8	116.6
Reductions for tax positions of prior years	(59.3)	(15.2)	(45.2)
Settlements	(2.4)	(171.9)	(446.2)
Lapses of statutes of limitation	(19.3)	(110.0)	(4.0)
Changes related to the impact of foreign currency translation, increase	10.8
Changes related to the impact of foreign currency translation, decrease		(4.3)	(24.7)
Unrecognized Tax Benefits	$ 1,014.5	$ 853.4	$ 1,066.6

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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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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