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Other Financial Instruments and Fair Value Measurements (Details) - USD ($)
$ in Millions
Oct. 31, 2017
Apr. 30, 2017
Carrying amount and fair value of financial instruments    
Long-term debt [1] $ (4,793.7) $ (4,944.5)
Carrying Amount [Member]    
Carrying amount and fair value of financial instruments    
Marketable securities and other investments 47.6 47.3
Derivative financial instruments – net 1.2 (12.9)
Long-term debt (4,793.7) (4,944.5)
Fair Value [Member]    
Carrying amount and fair value of financial instruments    
Marketable securities and other investments 47.6 47.3
Derivative financial instruments – net 1.2 (12.9)
Long-term debt $ (4,911.8) $ (5,023.8)
[1] Represents the carrying amount included in the Condensed Consolidated Balance Sheets, which includes the impact of terminated interest rate swaps, offering discounts, and capitalized debt issuance costs.