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Risk Management Activities (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2017
Feb. 26, 2017
Feb. 26, 2017
Feb. 28, 2016
Derivative [Line Items]        
Issuance of long-term debt     $ 750.0 $ 542.9
Credit Risk [Abstract]        
Accounts Payable to Suppliers that Utilize Third Party Service   $ 563.0 563.0  
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   $ 279.1 $ 279.1  
Derivative Contracts Inputs, Average Period of Utilization     12 months  
Energy Related Derivative [Member]        
Derivative [Line Items]        
Derivative, Notional Amount   57.9 $ 57.9  
Agricultural Related Derivative [Member]        
Derivative [Line Items]        
Derivative, Notional Amount   221.2 221.2  
Treasury Lock [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, Average Fixed Interest Rate   2.00% 2.00%  
Derivative, Maturity Date     Feb. 15, 2017  
Treasury Lock Two Expiring February 2017 [Member]        
Derivative [Line Items]        
Derivative, Notional Amount   $ 100.0 $ 100.0  
Derivative, Average Fixed Interest Rate   2.00% 2.00%  
Derivative, Maturity Date     Feb. 15, 2017  
Foreign Exchange Contracts [Member]        
Derivative [Line Items]        
Derivative, Notional Amount   $ 871.0 $ 871.0