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Acquisitions - Bemis Fair Value Consideration (Details) - Bemis Acquisition $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Business Acquisition [Line Items]
Bemis shares outstanding at June 11, 2019 (in millions) | shares	91.7
Share exchange ratio	5.1
Price per share (based on Amcor’s closing share price on June 11, 2019) | $ / shares	$ 11.18
Total equity consideration ($ in millions) | $	$ 5,229.6

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

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