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Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Summary of Significant Accounting Policies (Textual) [Abstract]
Authorization for repurchase shares by board of director				$ 200
Shares repurchased, shares	0
Share repurchase program effective date				Jan. 01, 2011
Share repurchase program expiry date				Dec. 31, 2012
Maximum period to own lease fleet to adopt emerging industry policy			1 year
Minimum period to own lease fleet to recognize sale of Railcars as net gain loss			1 year
Decrease in revenue from reclassification adjustments of prior period		$ 10.0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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