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Other Financial Instruments and Fair Value Measurements (Details 1) - Fair value measurements recurring [Member] - USD ($) $ in Millions | Jan. 31, 2022 | Apr. 30, 2021
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Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Total long-term debt | [1] | $ (4,524.9) | $ (5,034.5)
Total financial instruments measured at fair value |  | (4,475.8) | (4,967.7)
Equity mutual funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 7.0 | 6.3
Municipal obligations |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 22.8 | 24.4
Money market funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.2 | 0.3
Commodity contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | 17.9 | 39.4
Foreign currency exchange contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | 1.2 | (3.6)
Fair Value, Inputs, Level 1 [Member] |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Total long-term debt | [1] | (4,524.9) | (5,034.5)
Total financial instruments measured at fair value |  | (4,497.6) | (4,988.9)
Fair Value, Inputs, Level 1 [Member] | Equity mutual funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 7.0 | 6.3
Fair Value, Inputs, Level 1 [Member] | Municipal obligations |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Money market funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.2 | 0.3
Fair Value, Inputs, Level 1 [Member] | Commodity contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | 20.1 | 39.4
Fair Value, Inputs, Level 1 [Member] | Foreign currency exchange contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | 0.0 | (0.4)
Fair Value, Inputs, Level 2 [Member] |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Total long-term debt | [1] | 0.0 | 0.0
Total financial instruments measured at fair value |  | 21.8 | 21.2
Fair Value, Inputs, Level 2 [Member] | Equity mutual funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Municipal obligations |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 22.8 | 24.4
Fair Value, Inputs, Level 2 [Member] | Money market funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Commodity contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | (2.2) | 0.0
Fair Value, Inputs, Level 2 [Member] | Foreign currency exchange contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | 1.2 | (3.2)
Fair Value, Inputs, Level 3 [Member] |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Total long-term debt | [1] | 0.0 | 0.0
Total financial instruments measured at fair value |  | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Equity mutual funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Municipal obligations |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Money market funds |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Marketable securities and other investments | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Commodity contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Foreign currency exchange contracts - net |  |  |
Financial assets (liabilities) measured at fair value on a recurring basis |  |  |
Derivative financial instruments | [3] | $ 0.0 | $ 0.0
[1] | Long-term debt is composed of public Senior Notes, which are traded in an active secondary market and valued using quoted prices. For additional information, see Note 8: Debt and Financing Arrangements.
[2] | Marketable securities and other investments consist of funds maintained for the payment of benefits associated with nonqualified retirement plans. The funds include equity securities listed in active markets, municipal obligations valued by a third party using valuation techniques that utilize inputs that are derived principally from or corroborated by observable market data, and money market funds with maturities of three months or less. Based on the short-term nature of these money market funds, carrying value approximates fair value. As of January 31, 2022, our municipal obligations are scheduled to mature as follows: $1.2 in 2022, $2.0 in 2024, $2.9 in 2025, $1.6 in 2026, and the remaining $15.1 in 2027 and beyond. We do not have any municipal obligations scheduled to mature in 2023.
[3] | Level 1 commodity and foreign currency exchange derivatives are valued using quoted market prices for identical instruments in active markets. Level 2 commodity and foreign currency exchange derivatives are valued using quoted prices for similar assets or liabilities in active markets. For additional information, see Note 10: Derivative Financial Instruments.

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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