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Debt and Financing Arrangements (Details) - USD ($)
$ in Millions
Apr. 30, 2015
Mar. 20, 2015
Mar. 02, 2015
Apr. 30, 2014
Debt and Financing Arrangements [Abstract]        
Total long-term debt $ 5,944.9     $ 1,973.1
Current portion of long-term debt 0.0     100.0
Total long-term debt, less current portion 5,944.9     1,873.1
Long-term debt        
Debt instrument face amount   $ 3,700.0    
Senior Notes [Member]        
Long-term debt        
Debt instrument face amount   $ 3,700.0    
4.78% Senior Notes due June 1, 2014 [Member]        
Long-term debt        
Company issued Senior Notes $ 0.0     100.0
Interest rate on notes 4.78%      
Debt instrument face amount $ 0.0     100.0
6.12% Senior Notes due November 1, 2015 [Member]        
Long-term debt        
Company issued Senior Notes $ 0.0     24.0
Interest rate on notes 6.12%      
Debt instrument face amount $ 0.0     24.0
6.63% Senior Notes due November 1, 2018 [Member]        
Long-term debt        
Company issued Senior Notes $ 0.0     391.4
Interest rate on notes 6.63%      
Debt instrument face amount $ 0.0     376.0
3.50% Senior Notes due October 15, 2021 [Member]        
Long-term debt        
Interest rate on notes 3.50%      
Debt instrument face amount $ 750.0     750.0
Notes Payable, Noncurrent 796.0     758.8
5.55% Senior Notes due April 1, 2022 [Member]        
Long-term debt        
Company issued Senior Notes $ 0.0     299.2
Interest rate on notes 5.55%      
Debt instrument face amount $ 0.0     300.0
4.50% Senior Notes due June 1, 2025 [Member]        
Long-term debt        
Company issued Senior Notes $ 0.0     399.7
Interest rate on notes 4.50%      
Debt instrument face amount $ 0.0     400.0
1.75% Senior Notes due March 15, 2018 {Member]        
Long-term debt        
Company issued Senior Notes $ 496.9     0.0
Interest rate on notes 1.75%      
Debt instrument face amount $ 500.0     0.0
2.50% Senior Notes due March 15, 2020 [Member]        
Long-term debt        
Company issued Senior Notes $ 494.3     0.0
Interest rate on notes 2.50%      
Debt instrument face amount $ 500.0     0.0
3.00% Senior Notes due March 15, 2022 [Member]        
Long-term debt        
Company issued Senior Notes $ 395.3     0.0
Interest rate on notes 3.00%      
Debt instrument face amount $ 400.0     0.0
3.50% Senior Notes due March 15, 2025 [Member]        
Long-term debt        
Company issued Senior Notes $ 991.9     0.0
Interest rate on notes 3.50%      
Debt instrument face amount $ 1,000.0     0.0
4.25% Senior Notes due March 15, 2035 [Member]        
Long-term debt        
Company issued Senior Notes $ 641.8     0.0
Interest rate on notes 4.25%      
Debt instrument face amount $ 650.0     0.0
4.38% Senior Notes due March 15, 2045 [Member]        
Long-term debt        
Company issued Senior Notes $ 583.8     0.0
Interest rate on notes 4.38%      
Debt instrument face amount $ 600.0     0.0
Term Loan Credit Agreement due March 23, 2020 [Member]        
Long-term debt        
Debt instrument face amount 1,550.0   $ 1,800.0 0.0
Term loan credit agreement carrying value 1,544.9     0.0
Total Long Term Debt [Member]        
Long-term debt        
Debt instrument face amount 5,950.0     1,950.0
Current Portion Of Long Term Debt [Member]        
Long-term debt        
Debt instrument face amount 0.0     100.0
Total Long Term Debt Less Current Portion [Member]        
Long-term debt        
Debt instrument face amount $ 5,950.0     $ 1,850.0