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Derivatives and Hedging Activities - Narrative (Details) lb in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) lb | Mar. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) lb | Mar. 31, 2015 USD ($) | Jun. 30, 2015 USD ($)
Fair value of derivatives |  |  |  |  |
Total asset derivatives on a gross basis | $ 10.9 |  | $ 10.9 |  |
Total liability derivatives on a gross basis | 64.8 |  | 64.8 |  |
Cash collateral held by counterparties | $ 8.0 |  | 8.0 |  | $ 0.0
Net derivative losses included in AOCI expected to be reclassified into earnings |  |  | $ (23.2) |  |
Cash flow hedges | Commodity contracts |  |  |  |  |
Fair value of derivatives |  |  |  |  |
Amounts of raw materials to be purchased from forward contracts (in pounds) | lb | 22.5 |  | 22.5 |  |
Cash flow hedges | Interest rate swaps |  |  |  |  |
Fair value of derivatives |  |  |  |  |
Net gains recorded as a reduction to interest expense | $ 0.1 | $ 0.1 | $ 0.3 | $ 0.3 |
Fair value hedging | Interest rate swaps |  |  |  |  |
Fair value of derivatives |  |  |  |  |
Net gains recorded as a reduction to interest expense | 0.6 | $ 0.8 | 1.9 | $ 2.1 |
Total notional amounts of interest rate contracts | $ 150.0 |  | $ 150.0 |  | $ 150.0

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