BUSINESS COMBINATIONS - Pro Forma Schedule (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended	6 Months Ended
Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma Net revenues		$ 2,394.6	$ 4,584.2
Pro forma Net income (loss)		123.9	8.5
Pro forma Net income attributable to Coty Inc.		$ 118.6	$ (6.0)
Pro forma Net income attributable to Coty Inc. per common share:
Basic (in dollars per share)		$ 0.16	$ (0.01)
Diluted (in dollars per share)		$ 0.16	$ (0.01)
Inventory step-up adjustment		$ 36.5	$ 36.5
Galleria
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Number of shares received by former holders of Galleria common stock (in shares)	409.7
Acquisition-related Costs \| Galleria
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma Net income (loss)		$ 134.9	$ 316.6

Business Acquisition, Pro Forma Earnings Per Share [Abstract]

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- Definition

Business Acquisition, Pro Forma Net Income (Loss) Attributable to Parent

+ References

No definition available.

+ Details

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472

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