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Derivatives (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Amounts related to cash flow hedges
Expense for (benefit from) income taxes	$ (2.4)	$ (0.2)
Commodity Price Hedges [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	6.7	0.8
Amounts related to cash flow hedges
Losses (gains) included in AOCI, net of tax	$ 4.3	$ 0.6

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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