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DERIVATIVE FINANCIAL INSTRUMENTS - SUMMARY OF INTEREST RATE SWAPS (Details) € in Millions, £ in Millions, gal in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 GBP (£) gal | Jun. 30, 2018 EUR (€) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
Interest Rate Swap - April 1, 2019 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  | $ 500.0 |
Interest Rate Swap - October 1, 2020 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  | 750.0 |
Interest Rate Swap - July 15, 2021 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  | 500.0 |
Interest Rate Swap - March 2025 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  |  | $ 500.0
Hedging of foreign currency risk - June 2019 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  | 384.0 |
Hedging of foreign currency risk - June 2021 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  | 44.0 |
Hedging of foreign currency risk - June 2021 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  | 300.0 |
Hedging of foreign currency risk - July 2021 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value |  |  | $ 30.0 |
Hedging of foreign currency risk - July 2021 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value | £ | £ 234 |  |  |
Hedging of foreign currency risk - August 2021 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value | £ | £ 466 |  |  |
Hedging of foreign currency risk - June 2023 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value | € |  | € 500 |  |
Hedging of fuel risk |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount (in gallons) | gal | 46 |  |  |

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