Investments in Affiliated Companies (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments in affiliated companies by segment
Investments in Affiliated Companies	$ 513.8	$ 486.1	$ 452.2
Rail [Member]
Investments in affiliated companies by segment
Investments in Affiliated Companies	142.2	141.0	120.9
Portfolio Management [Member]
Investments in affiliated companies by segment
Investments in Affiliated Companies	$ 371.6	$ 345.1	$ 331.3

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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