Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Forward exchange contracts and options designated as hedging instruments, assets	$ 15.2	$ 5.6
Forward exchange contracts and options designated as hedging instruments, liabilities	34.1	49.0
Fair value assets	13.0	12.4
Equity Funds [Member]
Fair value assets	12.4	10.5
Common Stock [Member]
Fair value assets		1.3
Money Market Funds [Member]
Fair value assets	0.6	0.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Forward exchange contracts and options designated as hedging instruments, assets	0.0	0.0
Forward exchange contracts and options designated as hedging instruments, liabilities	0.0	0.0
Fair value assets	13.0	12.4
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Equity Funds [Member]
Fair value assets	12.4	10.5
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Common Stock [Member]
Fair value assets		1.3
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Money Market Funds [Member]
Fair value assets	0.6	0.6
Significant Other Observable Inputs (Level 2) [Member]
Forward exchange contracts and options designated as hedging instruments, assets	15.2	5.6
Forward exchange contracts and options designated as hedging instruments, liabilities	34.1	49.0
Fair value assets	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member] \| Equity Funds [Member]
Fair value assets	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member] \| Common Stock [Member]
Fair value assets		0.0
Significant Other Observable Inputs (Level 2) [Member] \| Money Market Funds [Member]
Fair value assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member]
Forward exchange contracts and options designated as hedging instruments, assets	0.0	0.0
Forward exchange contracts and options designated as hedging instruments, liabilities	0.0	0.0
Fair value assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Equity Funds [Member]
Fair value assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Common Stock [Member]
Fair value assets		0.0
Significant Unobservable Inputs (Level 3) [Member] \| Money Market Funds [Member]
Fair value assets	$ 0.0	$ 0.0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

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Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments.

+ References

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