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Debt (Narrative) (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2018
USD ($)
Oct. 31, 2017
USD ($)
Mar. 31, 2017
EUR (€)
Feb. 28, 2017
USD ($)
Jan. 31, 2017
USD ($)
Nov. 26, 2017
USD ($)
Feb. 26, 2017
USD ($)
Feb. 25, 2018
USD ($)
Feb. 26, 2017
USD ($)
Debt Instrument [Line Items]                  
Long-term debt, carrying value               $ 8,414.1  
Repayment of long-term debt               600.0 $ 1,003.0
Issuance of long-term debt               $ 500.0 $ 750.0
Medium Term Notes [Member]                  
Debt Instrument [Line Items]                  
Repayment of long-term debt $ 113.8                
Face amount of debt repurchased $ 100.0                
Fixed interest rate percentage 6.39%                
Maturity date May 28, 2023                
Premium payment recorded as interest expense $ 13.8                
2.6% Notes Due October 2022 [Member]                  
Debt Instrument [Line Items]                  
Fixed interest rate percentage   2.60%              
Maturity date   Oct. 12, 2022              
Issuance of long-term debt   $ 500.0       $ 500.0      
1.4% Notes Due October 2017 [Member]                  
Debt Instrument [Line Items]                  
Repayment of long-term debt   $ 500.0              
Fixed interest rate percentage   1.40%              
Floating Rate Notes Due March 2019 [Member]                  
Debt Instrument [Line Items]                  
Maturity date     Mar. 20, 2019            
Issuance of long-term debt | €     € 300.0            
5.7% Notes Due February 2017 [Member]                  
Debt Instrument [Line Items]                  
Repayment of long-term debt       $ 1,000.0          
Fixed interest rate percentage       5.70%          
3.2% Notes Due February 2027 [Member]                  
Debt Instrument [Line Items]                  
Fixed interest rate percentage         3.20%        
Maturity date         Feb. 10, 2027        
Issuance of long-term debt         $ 750.0   $ 750.0    
Long-term Debt Agreements Containing Restrictive Covenants [Member]                  
Debt Instrument [Line Items]                  
Covenant compliancee               As of quarter end, we were in compliance with all of these covenants.  
Fair Value Inputs Level 2 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, fair value               $ 8,512.6