Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Gross unrecognized tax benefits:
Gross unrecognized income tax benefits, beginning of period	$ 133.0	$ 130.6
Additions for tax positions of the current year	14.4	14.4
Additions for tax positions of prior years	15.2	7.1
Reductions for tax positions of prior years for:
Changes in judgments	(1.2)	(0.3)
Settlements during the year	(13.8)	0.0
Lapses of applicable statute of limitations	(5.0)	(5.8)
Foreign currency translation	(2.7)	(13.0)
Gross unrecognized income tax benefits, end of period	$ 139.9	$ 133.0

Unrecognized Tax Benefits, Decreases Resulting from Changes in Judgments

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Unrecognized Tax Benefits, Reductions in Tax Positions [Abstract]

+ References

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

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- Definition

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
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&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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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 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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Amount of increase 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 lapses of applicable statutes of limitations.

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