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Derivatives (AOCL Related to Cash Flow Hedges) (Details) - Cash Flow Hedge [Member] - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized losses on unsettled futures contracts $ 1.2 $ 13.2
Income tax benefit (0.4) (4.8)
Losses included in AOCL, net of tax 0.8 $ 8.4
Cash flow hedge derivative losses expected to be reclassified into earnings within the next 12 months $ 1.4