| New Accounting Guidance (Policies) | 9 Months Ended |
| Mar. 31, 2021 |
| Accounting Policies [Abstract] | |
| Basis of Accounting | The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information. Consistent with these requirements, this Form 10-Q does not include all the information required by U.S. GAAP for complete financial statements. It is management's opinion, however, that all material adjustments (consisting only of normal recurring accruals) have been made that are necessary for a fair statement of its interim financial position, results of operations and cash flows. For further information, this Form 10-Q should be read in conjunction with the audited Consolidated Financial Statements and accompanying Notes in the Company's Annual Report on Form 10-K for the fiscal year ended June 30, 2020. There have been no material changes in the accounting policies followed by the Company during the current fiscal year other than the adoption of a new accounting pronouncement discussed below. |
| Reclassifications | Certain amounts in the Company's notes to condensed consolidated financial statements may not add or recalculate due to rounding. |
| Recently Adopted Accounting Standards and Accounting Standards Not Yet Adopted | Recently Adopted Accounting Standards In June 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-13, which is guidance requiring financial assets, or a group of financial assets measured at amortized cost basis to be presented at the net amount expected to be collected when finalized using a loss methodology known as the current expected credit loss methodology ("CECL"). The allowance for credit losses is a valuation account that will be deducted from the amortized cost basis of the financial asset to present the net carrying value at the amount expected to be collected on the financial asset. This updated guidance impacts loans, debt securities, trade receivables, net investments in leases, off-balance-sheet credit exposures, reinsurance receivables and any other financial assets not excluded from the scope that have the contractual right to receive cash. The guidance was effective for the Company on July 1, 2020 and was adopted using the modified retrospective approach. As a result, the Company changed its disclosures related to credit losses; refer to Note 9, "Trade Receivables, Net." The cumulative effect of the changes made to the Company's consolidated July 1, 2020 balance sheet related to the adoption of CECL is as follows: ($ in millions) June 30, 2020 Adjustments Due to Adoption July 1, 2020 Trade receivables, net $ 1,616 $ (7) $ 1,609 Deferred tax assets 135 2 137 Retained earnings 246 (5) 241 Accounting Standards Not Yet Adopted In December 2019, the FASB issued updated guidance to simplify the accounting for income taxes by removing certain exceptions and improving the consistent application of U.S. GAAP in other tax accounting areas. This guidance is effective for annual reporting periods, and any interim periods within those annual periods, that begin after December 15, 2020 with early adoption permitted. The Company is currently evaluating the effects adoption of this guidance will have on the consolidated financial statements and does not expect the adoption will be material to its consolidated financial statements and related disclosures when adopted on July 1, 2021. In March 2020, the FASB issued optional expedients and exceptions to ease the potential burden in accounting for reference rate reform related to contract modifications, hedging relationships, and other transactions that reference the London Interbank Offered Rate ("LIBOR") or another reference rate expected to be discontinued, subject to meeting certain criteria. The Company is currently evaluating its agreements and the optional expedients provided by the new standard. The Company considers the applicability and impact of all ASUs issued by the FASB. The Company determined that all other ASUs not yet adopted to be either not applicable or are expected to have minimal impact on the Company's consolidated financial statements at this time. |
| Restructuring | Restructuring related costs are directly attributable to restructuring activities; however, they do not qualify for special accounting treatment as exit or disposal activities. General integration costs are not linked to restructuring. The Company believes the disclosure of restructuring related costs provides more information on the total cost of the 2019 Bemis Integration Plan. The restructuring related costs relate primarily to the closure of facilities and include costs to replace graphics, train new employees on relocated equipment and anticipated losses on sale of closed facilitiesThe costs related to restructuring activities have been presented on the unaudited condensed consolidated statements of income as restructuring and related expenses. The accruals related to restructuring activities have been recorded on the unaudited condensed consolidated balance sheets under other current liabilities and other non-current liabilities. |
| Fair Value Measurements | Fair Value Measurements The fair values of the Company’s financial assets and financial liabilities listed below reflect the amounts that would be received to sell the assets or paid to transfer the liabilities in an orderly transaction between market participants at the measurement date (exit price). The Company’s non-derivative financial instruments primarily include cash and cash equivalents, trade receivables, trade payables, short-term debt and long-term debt. At March 31, 2021 and June 30, 2020, the carrying value of these financial instruments, excluding long-term debt, approximates fair value because of the short-term nature of these instruments. The fair value of long-term debt with variable interest rates approximates its carrying value. The fair value of the Company’s long-term debt with fixed interest rates is based on market prices, if available, or expected future cash flows discounted at the current interest rate for financial liabilities with similar risk profiles. Contingent consideration obligations arise from business acquisitions. The Company's contingent consideration liabilities consist of an $11 million liability that is contingent on future royalty income generated by Discma AG, a subsidiary acquired in March 2017, with the $8 million balance relating to consideration for small business acquisitions where payments are contingent on the Company vacating a certain property or performance criteria. The fair value of the contingent purchase consideration liabilities was determined for each arrangement individually. The fair value was determined using the income approach with significant inputs that are not observable in the market. Key assumptions include the discount rates consistent with the level of risk of achievement and probability adjusted financial projections. The expected outcomes are recorded at net present value, which requires adjustment over the life for changes in risks and probabilities. Changes arising from modifications in forecasts related to contingent consideration are expected to be immaterial. The fair value of contingent purchase consideration liabilities is included in other current liabilities and other non-current liabilities in the unaudited condensed consolidated balance sheets. Assets and Liabilities Measured and Recorded at Fair Value on a Nonrecurring Basis In addition to assets and liabilities that are recorded at fair value on a recurring basis, the Company records assets and liabilities at fair value on a nonrecurring basis. The Company measures certain assets, including technology intangible assets, equity method and other investments and other intangible assets at fair value on a nonrecurring basis when they are deemed to be other than temporarily impaired. The fair values of these assets are determined, when applicable, based on valuation techniques using the best information available, and may include quoted market prices, market comparables and discounted cash flow projections. The Company sold its equity method investment in AMVIG Holdings Limited ("AMVIG") on September 30, 2020. Refer to Note 17, "Disposals." |
| Derivative Instruments | Derivative Instruments The Company periodically uses derivatives and other financial instruments to hedge exposures to interest rate, commodity and currency risks. The Company does not hold or issue financial instruments for speculative or trading purposes. For hedges that meet the hedge accounting criteria, the Company, at inception, formally designates and documents the instrument as a fair value hedge or a cash flow hedge of a specific underlying exposure. On an ongoing basis, the Company assesses and documents that its hedges have been and are expected to continue to be highly effective. Interest Rate Risk The Company’s policy is to manage exposure to interest rate risk by maintaining a mixture of fixed-rate and variable-rate debt, monitoring global interest rates and, where appropriate, hedging floating interest rate exposure or debt at fixed interest rates through various interest rate derivative instruments, including, but not limited to, interest rate swaps, cross-currency interest rate swaps, and interest rate locks. For interest rate swaps that are accounted for as fair value hedges, changes in the fair value of both the hedging instruments and the underlying debt obligations are immediately recognized in interest expense. Changes in the fair value of interest rate swaps that have not been designated as hedging instruments are reported in the accompanying unaudited condensed consolidated statements of income under other non-operating income, net. Foreign Currency Risk The Company manufactures and sells its products and finances its operations in a number of countries throughout the world and, as a result, is exposed to movements in foreign currency exchange rates. The purpose of the Company’s foreign currency hedging program is to manage the volatility associated with the changes in exchange rates. To manage this exchange rate risk, the Company utilizes forward contracts. Contracts that qualify for hedge accounting are designated as cash flow hedges of certain forecasted transactions denominated in foreign currencies. The effective portion of the changes in fair value of these instruments is reported in accumulated other comprehensive loss ("AOCI") and reclassified into earnings in the same financial statement line item and in the same period or periods during which the related hedged transactions affect earnings. The ineffective portion is recognized in earnings over the life of the hedging relationship in the same unaudited condensed consolidated statements of income line item as the underlying hedged item. Changes in the fair value of forward contracts that have not been designated as hedging instruments are reported in the accompanying unaudited condensed consolidated statements of income. Commodity Risk Certain raw materials used in the Company's production processes are subject to price volatility caused by weather, supply conditions, political and economic variables and other unpredictable factors. The Company's policy is to minimize exposure to price volatility by passing through the commodity price risk to customers, including through the use of fixed price swaps. The Company purchases on behalf of customers fixed price commodity swaps to offset the exposure of price volatility on the underlying sales contracts. These instruments are cash closed out on maturity and the related cost or benefit is passed through to customers. Information about commodity price exposure is derived from supply forecasts submitted by customers |
| Allowance for Doubtful Accounts | The Company determines its allowance for doubtful accounts using a combination of factors, including customer creditworthiness, past transaction history with the customer and changes in customer payment terms or practices. In addition, overall historical collection experience, current economic industry trends and a review of the current status of trade accounts receivable are considered when determining the required allowance for doubtful accounts |
| Components of Net Periodic Costs | Service cost is included in operating income. All other components of net periodic benefit cost other than service cost are recorded within other non-operating income, net |
| Income Taxes | Income Taxes The provision for income taxes for the three and nine months ended March 31, 2021 and 2020 is based on the Company’s estimated annual effective tax rate for the respective fiscal years before income taxes and equity in income of affiliated companies and adjusted for specific items that are required to be recognized in the period in which they are incurred. |
| Segments | Segments The Company's business is organized and presented in the two reportable segments outlined below: Flexibles: Consists of operations that manufacture flexible and film packaging in the food and beverage, medical and pharmaceutical, fresh produce, snack food, personal care, and other industries. Rigid Packaging: Consists of operations that manufacture rigid containers for a broad range of predominantly beverage and food products, including carbonated soft drinks, water, juices, sports drinks, milk-based beverages, spirits and beer, sauces, dressings, spreads and personal care items and plastic caps for a wide variety of applications. Other consists of the Company's undistributed corporate expenses including executive and functional compensation costs, equity method investments, intercompany eliminations and other business activities. The accounting policies of the reportable segments are the same as those in the consolidated financial statements. During the first quarter of fiscal 2021, the Company revised the presentation of adjusted earnings before interest and tax ("Adjusted EBIT") from continuing operations in the reportable segments to include an allocation of certain research and development and selling, general and administrative expenses that management previously reflected in Other. The Company refines its expense allocation methodologies to the reportable segments periodically as more relevant information becomes available and to align with industry or market changes. Corporate expenses are allocated to the reportable segments based primarily on direct attribution. Prior periods have been recast to conform to the new cost allocation methodology. |
| Earnings Per Share Computations | Earnings Per Share Computations The Company applies the two-class method when computing its earnings per share ("EPS"), which requires that net income per share for each class of share be calculated assuming all of the Company's net income is distributed as dividends to each class of share based on their contractual rights. Basic EPS is computed by dividing net income available to ordinary shareholders by the weighted-average number of ordinary shares outstanding after excluding the ordinary shares to be repurchased using forward contracts. Diluted EPS includes the effects of share options, restricted shares, performance rights, performance shares and share rights, if dilutive. |
