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Derivatives and Hedging Activities - Narrative (Details) lb in Millions | 12 Months Ended
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Jun. 30, 2018 USD ($) lb | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative contracts on a gross basis | $ 41,700,000 |  |
Derivative contracts liability on a gross basis | 9,900,000 |  |
Cash collateral held by counterparties | 0 |  |
Derivative losses included in AOCI | 15,400,000 |  |
Cash flow hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net gains recorded as a reduction to interest expense | $ 41,000,000 | $ 9,300,000 | $ (33,300,000)
Commodity contracts | Cash flow hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts of raw materials to be purchased from forward contracts (in lb) | lb | 23.2 |  |
Net gains recorded as a reduction to interest expense | $ 41,400,000 | 9,400,000 | (34,000,000)
Forward interest rate swaps | Cash flow hedges | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net gains recorded as a reduction to interest expense | 300,000 | 300,000 | 300,000
Forward interest rate swaps | Fair Value Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total notional amounts of interest rate contracts | 150,000,000 | 150,000,000 |
Net gains recorded as a reduction to interest expense | $ 400,000 | $ 1,800,000 | $ 2,600,000

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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