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Financial Instruments (Details 1) (Fuel hedges [Member], Derivatives in Cash Flow Hedging Relationships [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Impact of hedges on results of operations and comprehensive income | |||
| Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ (1.7) | $ 0.8 | $ 6.1 |
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Cost of operations [Member]
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| Impact of hedges on results of operations and comprehensive income | |||
| Amount of Realized Gain or (Loss) | 0.9 | (2.0) | (7.3) |
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Other income, net [Member]
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| Impact of hedges on results of operations and comprehensive income | |||
| Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) | $ 0.2 | ||
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- Details
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- Definition
The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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