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Derivatives (Details) (Commodity Price Hedges [Member], Cash Flow Hedging [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Commodity Price Hedges [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized losses on unsettled futures contracts	$ 5.8	$ 7.2
Income tax benefit	(2.1)	(2.6)
Losses included in AOCL, net of tax	3.7	4.6
Cash flow hedge derivative losses expected to be reclassified into earnings within the next 12 months	$ 3.8

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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