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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Leveraged Lease Obligations	Dec. 31, 2010 Leveraged Lease Obligations
Income Taxes [Line Items]
Income tax expense	$ 77.5	$ 100.2	$ 156.5	$ 181.2
Effective tax rate	33.80%	33.40%
Unrecognized tax benefits					$ 66.7	$ 66.7

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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