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Debt and Financing Arrangements (Tables)
12 Months Ended
Apr. 30, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consists of the following:
  
 
April 30, 2018
 
April 30, 2017
  
Principal
Outstanding
 
Carrying
   Amount (A)
 
Principal
Outstanding
 
Carrying      
Amount (A)      
 
1.75% Senior Notes due March 15, 2018
 
$

 
$

 
$
500.0

 
$
499.0

2.20% Senior Notes due December 6, 2019
 
300.0

 
298.6

 

 

2.50% Senior Notes due March 15, 2020
 
500.0

 
497.8

 
500.0

 
496.6

3.50% Senior Notes due October 15, 2021
 
750.0

 
775.6

 
750.0

 
782.6

3.00% Senior Notes due March 15, 2022
 
400.0

 
397.3

 
400.0

 
396.6

3.50% Senior Notes due March 15, 2025
 
1,000.0

 
994.4

 
1,000.0

 
993.6

3.38% Senior Notes due December 15, 2027
 
500.0

 
495.8

 

 

4.25% Senior Notes due March 15, 2035
 
650.0

 
643.1

 
650.0

 
642.6

4.38% Senior Notes due March 15, 2045
 
600.0

 
585.4

 
600.0

 
584.9

Term Loan Credit Agreement due March 23, 2020
 

 

 
550.0

 
548.6

Total long-term debt
 
$
4,700.0

 
$
4,688.0

 
$
4,950.0

 
$
4,944.5

Current portion of long-term debt
 

 

 
500.0

 
499.0

Total long-term debt, less current portion
 
$
4,700.0

 
$
4,688.0

 
$
4,450.0

 
$
4,445.5


(A) 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.