Commercial Commitments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Guarantor Obligations [Line Items]
Total commercial commitments	$ 134.0	$ 142.2
Affiliate guarantees [Member]
Guarantor Obligations [Line Items]
Total commercial commitments	42.0	30.0
Asset residual value guarantees [Member]
Guarantor Obligations [Line Items]
Total commercial commitments	33.9	48.0
Lease payment guarantees
Guarantor Obligations [Line Items]
Total commercial commitments	47.0	52.7
Standby letters of credit [Member]
Guarantor Obligations [Line Items]
Total commercial commitments	9.8	10.3
Performance Bonds [Member]
Guarantor Obligations [Line Items]
Total commercial commitments	$ 1.3	$ 1.2