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Derivative Instruments and Hedging Activities - Schedule of Derivative Assets, Liabilities and the Effects of Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Derivative assets:    
Derivative assets, gross $ 72.7 $ 58.5
Gross amounts offset in the balance sheet (35.0) (18.9)
Cash collateral received (0.3) 0.0
Total derivative assets - net 37.4 39.6
Derivative liabilities:    
Derivative liabilities, gross (105.4) (179.9)
Gross amounts offset in the balance sheet 35.0 18.9
Cash collateral pledged 0.0 8.0
Total derivative liabilities - net (70.4) (153.0)
Commodity Contract Subject to PGC and DS Mechanisms    
Derivative assets:    
Derivative assets, gross 4.5 1.3
Derivative liabilities:    
Derivative liabilities, gross (0.5) (5.6)
Designated as Hedging Instruments    
Derivative assets:    
Derivative assets, gross 17.8 29.5
Derivative liabilities:    
Derivative liabilities, gross (6.8) (10.9)
Designated as Hedging Instruments | Foreign Currency Contracts    
Derivative assets:    
Derivative assets, gross 17.8 29.1
Derivative liabilities:    
Derivative liabilities, gross (2.4) (0.1)
Designated as Hedging Instruments | Cross Currency Contracts    
Derivative assets:    
Derivative assets, gross 0.0 0.4
Derivative liabilities:    
Derivative liabilities, gross (0.5) 0.0
Designated as Hedging Instruments | Interest Rate Contracts    
Derivative liabilities:    
Derivative liabilities, gross (3.9) (10.8)
Not Designated as Hedging Instruments | Commodity Contracts    
Derivative assets:    
Derivative assets, gross 50.4 27.7
Derivative liabilities:    
Derivative liabilities, gross $ (98.1) $ (163.4)