Fair Value Measurements and Derivative Instruments (Details 6) (Fuel Price Risk, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Derivative disclosures
Derivative instrument, contractual life	4 years
Estimated unrealized net gains associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from other accumulated comprehensive income (loss)	$ 47.2	$ 78.5
Swaps \| 2012
Derivative disclosures
Fuel Swap Agreements (metric tons)		738,000
Percentage of projected requirements	0.00%	55.00%
Swaps \| 2013
Derivative disclosures
Fuel Swap Agreements (metric tons)	755,000	644,000
Percentage of projected requirements	55.00%	47.00%
Swaps \| 2014
Derivative disclosures
Fuel Swap Agreements (metric tons)	635,000	418,000
Percentage of projected requirements	45.00%	30.00%
Swaps \| 2015
Derivative disclosures
Fuel Swap Agreements (metric tons)	363,000	284,000
Percentage of projected requirements	25.00%	20.00%
Swaps \| 2016
Derivative disclosures
Fuel Swap Agreements (metric tons)	104,000
Percentage of projected requirements	7.00%
Options
Derivative disclosures
Net cash proceeds received upon termination of fuel swaps	$ 10.7

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Definition

Maximum length of time over which the entity is hedging its exposure.

+ References

No definition available.

+ Details

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- Definition

Proceeds from termination of fuel call options.

+ References

No definition available.

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- Details

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- Definition

The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

+ References

No definition available.

+ Details

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- Definition

The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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