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Risk Management Activities (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2017
Aug. 27, 2017
Feb. 26, 2017
Credit Risk [Abstract]      
Accounts Payable to Suppliers that Utilize Third Party Service   $ 724.7  
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   $ 290.6  
Derivative Contracts Inputs, Average Period of Utilization   12 months  
Energy Related Derivative [Member]      
Derivative [Line Items]      
Derivative, Notional Amount   $ 83.0  
Agricultural Related Derivative [Member]      
Derivative [Line Items]      
Derivative, Notional Amount   207.6  
Treasury Lock [Member]      
Derivative [Line Items]      
Cash paid (received) upon settlement     $ (17.2)
Treasury Lock Expiring October 2017 [Member]      
Derivative [Line Items]      
Derivative, Notional Amount   $ 500.0  
Derivative, Average Fixed Interest Rate   1.80%  
Derivative, Maturity Date   Oct. 15, 2017  
Treasury Lock One Expiring February 2017 [Member]      
Derivative [Line Items]      
Derivative, Notional Amount     $ 400.0
Derivative, Average Fixed Interest Rate     2.00%
Derivative, Maturity Date     Feb. 15, 2017
Treasury Lock Two Expiring February 2017 [Member]      
Derivative [Line Items]      
Derivative, Notional Amount     $ 100.0
Derivative, Average Fixed Interest Rate     2.00%
Derivative, Maturity Date     Feb. 15, 2017