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Other Financial Instruments and Fair Value Measurements (Details) - USD ($)
$ in Millions
Apr. 30, 2018
Apr. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt [1] $ (4,688.0) $ (4,944.5)
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities and other investments 45.8 47.3
Derivative financial instruments – net 9.7 (12.9)
Long-term debt (4,688.0) (4,944.5)
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities and other investments 45.8 47.3
Derivative financial instruments – net 9.7 (12.9)
Long-term debt $ (4,579.8) $ (5,023.8)
[1] Represents the carrying amount included in the Consolidated Balance Sheets, which includes the impact of terminated interest rate contracts, offering discounts, and capitalized debt issuance costs.