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Leases (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets that are financed with capital lease obligations
Capital leased assets gross	$ 82.6	$ 129.2
Less: allowance for depreciation	(67.7)	(88.8)
Capital Leased Assets Net	14.9	40.4
Railcars [Member]
Assets that are financed with capital lease obligations
Capital leased assets gross	3.6	22.2
Marine vessels [Member]
Assets that are financed with capital lease obligations
Capital leased assets gross	$ 79.0	$ 107.0

Property, plant, or equipment held under lease agreements classified as an asset.

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.