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Debt and Financing Arrangements (Tables)
9 Months Ended
Jan. 31, 2020
Debt Disclosure [Abstract]  
Long-term debt
Long-term debt consists of the following:
 January 31, 2020April 30, 2019
 Principal
Outstanding
Carrying
Amount (A)
Principal
Outstanding
Carrying
Amount (A)
2.20% Senior Notes due December 6, 2019$—  $—  $300.0  $299.5  
2.50% Senior Notes due March 15, 2020500.0  499.8  500.0  499.0  
3.50% Senior Notes due October 15, 2021750.0  762.9  750.0  768.4  
3.00% Senior Notes due March 15, 2022400.0  398.5  400.0  398.0  
3.50% Senior Notes due March 15, 20251,000.0  995.8  1,000.0  995.2  
3.38% Senior Notes due December 15, 2027500.0  496.6  500.0  496.2  
4.25% Senior Notes due March 15, 2035650.0  643.8  650.0  643.5  
4.38% Senior Notes due March 15, 2045600.0  586.4  600.0  586.0  
Term Loan Credit Agreement due May 14, 2021700.0  699.3  800.0  799.0  
Total long-term debt$5,100.0  $5,083.1  $5,500.0  $5,484.8  
Current portion of long-term debt500.0  499.8  800.0  798.5  
Total long-term debt, less current portion$4,600.0  $4,583.3  $4,700.0  $4,686.3  
(A) Represents the carrying amount included in the Condensed Consolidated Balance Sheets, which includes the impact of capitalized debt issuance costs, terminated interest rate contracts, and offering discounts.