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Risk Management Activities (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2017
Jan. 31, 2017
Nov. 26, 2017
Feb. 26, 2017
Feb. 25, 2018
Feb. 26, 2017
May 27, 2018
Derivative [Line Items]              
Issuance of long-term debt         $ 500.0 $ 750.0  
Credit Risk [Abstract]              
Accounts Payable to Suppliers that Utilize Third Party Service         927.0    
2.6% Notes Due October 2022 [Member]              
Derivative [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage 2.60%            
Issuance of long-term debt $ 500.0   $ 500.0        
Debt Instrument Term     5 years        
3.2% Notes Due February 2027 [Member]              
Derivative [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   3.20%          
Issuance of long-term debt   $ 750.0   $ 750.0      
Debt Instrument Term       10 years      
Commodity Contracts [Member]              
Derivative [Line Items]              
Derivative, Notional Amount         $ 377.9    
Derivative Contracts Inputs, Average Period of Utilization         12 months    
Energy Related Derivative [Member]              
Derivative [Line Items]              
Derivative, Notional Amount         $ 106.1    
Agricultural Related Derivative [Member]              
Derivative [Line Items]              
Derivative, Notional Amount         271.8    
Treasury Lock Expiring April 2018 [Member]              
Derivative [Line Items]              
Derivative, Notional Amount         $ 2,300.0    
Derivative, Maturity Date         Apr. 19, 2018    
Derivative, Average Fixed Interest Rate         2.90%    
Treasury Lock Expiring April 2018 [Member] | Maximum [Member]              
Derivative [Line Items]              
Derivative Liability, Fair Value         $ 1,000.0    
Treasury Lock Expiring April 2018 [Member] | Forecast [Member]              
Derivative [Line Items]              
Derivative, Notional Amount             $ 3,500.0
Treasury Lock Expiring October 2017 [Member]              
Derivative [Line Items]              
Derivative, Notional Amount     $ 500.0        
Derivative, Maturity Date     Oct. 15, 2017        
Derivative, Average Fixed Interest Rate     1.80%        
Cash paid (received) upon settlement     $ (3.7)        
Treasury Locks Expiring February 2017 [Member]              
Derivative [Line Items]              
Cash paid (received) upon settlement       $ (17.2)      
Treasury Lock One Expiring February 2017 [Member]              
Derivative [Line Items]              
Derivative, Notional Amount       $ 400.0   $ 400.0  
Derivative, Maturity Date       Feb. 15, 2017      
Derivative, Average Fixed Interest Rate       2.00%   2.00%  
Treasury Lock Two Expiring February 2017 [Member]              
Derivative [Line Items]              
Derivative, Notional Amount       $ 100.0   $ 100.0  
Derivative, Maturity Date       Feb. 15, 2017      
Derivative, Average Fixed Interest Rate       2.00%   2.00%