Investments in Affiliated Companies (Investments and Distributions) (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments	$ 29.7	$ 116.2	$ 64.7
Proceeds from Equity Method Investment, Dividends or Distributions	65.7	35.3	54.7
Rail North America [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments	0	0	36.8
Proceeds from Equity Method Investment, Dividends or Distributions	14.9	8.0	9.7
Rail International [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments	0	2.8	0
Proceeds from Equity Method Investment, Dividends or Distributions	0	0	0
Portfolio Management [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments	29.7	113.4	27.9
Proceeds from Equity Method Investment, Dividends or Distributions	$ 50.8	$ 27.3	$ 45.0