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Derivative Financial Instruments (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2015 | Nov. 30, 2018 | Jun. 30, 2018
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Interest expense – net | $ (45.1) | $ (51.6) | $ (143.6) | $ (158.8) |  |  |  |
Amortization of deferred gain on early termination agreement | 2.1 |  | 6.2 |  |  |  |  |
Derivative Financial Instruments (Additional Textual) [Abstract] |  |  |  |  |  |  |  |
Cash margin accounts related to derivative instruments recognized | 25.7 |  | 25.7 |  | $ 40.7 |  |  |
Cumulative net mark-to-market valuation of certain derivative positions recognized in unallocated derivative gains (losses) |  |  | $ (14.9) |  | (52.5) |  |  |
Commodity contracts |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Derivative instrument maturity |  |  | 1 year |  |  |  |  |
Gross notional amount | 808.9 |  | $ 808.9 |  | 544.8 |  |  |
Foreign currency exchange contracts |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Derivative instrument maturity |  |  | 1 year |  |  |  |  |
Gross notional amount | 88.1 |  | $ 88.1 |  | 144.9 |  |  |
Interest rate contracts |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Gross notional amount | 800.0 |  | 800.0 |  | 800.0 |  | $ 300.0 | $ 500.0
Deferred pre-tax gain (loss) included in accumulated other comprehensive loss | (172.0) |  | (172.0) |  | (52.5) |  |  |
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive loss | $ 39.6 |  | 39.6 |  | $ 12.1 |  |  |
Effective portion of the hedge loss reclassified to interest expense over the next twelve months |  |  | (8.9) |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  |  | (168.9) |  |  |  |  |
Total Through Q3 2020 [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Amortization of deferred gain on early termination agreement |  |  | 39.2 |  |  |  |  |
2020 [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Amortization of deferred gain on early termination agreement |  |  | 1.9 |  |  |  |  |
2021 [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Amortization of deferred gain on early termination agreement |  |  | 8.4 |  |  |  |  |
2022 [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Amortization of deferred gain on early termination agreement |  |  | $ 4.0 |  |  |  |  |
Cash [Member] | Interest rate swap | Fair Value Hedging [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Gain (loss) on early termination agreement |  |  |  |  |  | $ 58.1 |  |
Accrued and Prepaid Interest, Net [Member] | Interest rate swap | Fair Value Hedging [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |
Gain (loss) on early termination agreement |  |  |  |  |  | $ (4.6) |  |

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