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Other Financial Instruments and Fair Value Measurements (Details 1) - Fair value measurements recurring [Member] - USD ($)
$ in Millions
Apr. 30, 2022
Apr. 30, 2021
Financial assets (liabilities) measured at fair value on a recurring basis    
Total long-term debt [1] $ (3,977.7) $ (5,034.5)
Total financial instruments measured at fair value (3,926.3) (4,967.7)
Equity mutual funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 5.7 6.3
Municipal obligations [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 19.9 24.4
Money Market Funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 1.0 0.3
Commodity contracts - net    
Financial assets (liabilities) measured at fair value on a recurring basis    
Derivative financial instruments [3] 23.1 39.4
Foreign currency exchange contracts - net    
Financial assets (liabilities) measured at fair value on a recurring basis    
Derivative financial instruments [3] 1.7 (3.6)
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets (liabilities) measured at fair value on a recurring basis    
Total long-term debt [1] (3,977.7) (5,034.5)
Total financial instruments measured at fair value (3,947.4) (4,988.9)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity mutual funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 5.7 6.3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal obligations [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 0.0 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 1.0 0.3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts - net    
Financial assets (liabilities) measured at fair value on a recurring basis    
Derivative financial instruments [3] 23.4 39.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency exchange contracts - net    
Financial assets (liabilities) measured at fair value on a recurring basis    
Derivative financial instruments [3] 0.2 (0.4)
Significant Observable Inputs (Level 2)    
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 21.1 21.2
Significant Observable Inputs (Level 2) | Equity mutual funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 0.0 0.0
Significant Observable Inputs (Level 2) | Municipal obligations [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 19.9 24.4
Significant Observable Inputs (Level 2) | Money Market Funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 0.0 0.0
Significant Observable Inputs (Level 2) | Commodity contracts - net    
Financial assets (liabilities) measured at fair value on a recurring basis    
Derivative financial instruments [3] (0.3) 0.0
Significant Observable Inputs (Level 2) | Foreign currency exchange contracts - net    
Financial assets (liabilities) measured at fair value on a recurring basis    
Derivative financial instruments [3] 1.5 (3.2)
Significant Unobservable Inputs (Level 3)    
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
Significant Unobservable Inputs (Level 3) | Equity mutual funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 0.0 0.0
Significant Unobservable Inputs (Level 3) | Municipal obligations [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 0.0 0.0
Significant Unobservable Inputs (Level 3) | Money Market Funds [Member]    
Financial assets (liabilities) measured at fair value on a recurring basis    
Marketable securities and other investments [2] 0.0 0.0
Significant Unobservable Inputs (Level 3) | Commodity contracts - net    
Financial assets (liabilities) measured at fair value on a recurring basis    
Derivative financial instruments [3] 0.0 0.0
Significant Unobservable Inputs (Level 3) | 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 7: 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 April 30, 2022, our municipal obligations are scheduled to mature as follows: $0.2 in 2023, $1.9 in 2024, $1.8 in 2025, $2.1 in 2026, $4.4 in 2027, and the remaining $9.5 in 2028 and beyond. For additional information, see Marketable Securities and Other Investments in Note 1: Accounting Policies.
[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 9: Derivative Financial Instruments.