Investments in Affiliated Companies (Details 5) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Lease and loan payment guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees	$ 42.0	$ 30.0
Asset residual value guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees	$ 0	$ 13.8