Property, Plant, and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components of property, plant, and equipment
Less: accumulated depreciation	$ (1,343.0)	$ (1,177.7)
Property, plant, and equipment, net before adjustment to net deferred profit	4,861.7	4,690.6
Net deferred profit on railcars sold to the Leasing Group	(562.7)	(531.5)
Property, plant, and equipment, net	4,299.0	4,159.1
TRIP Holdings
Components of property, plant, and equipment
Less: accumulated depreciation	(153.8)	(122.7)
Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	1,260.1	1,171.7
Less: accumulated depreciation	(720.8)	(682.1)
Property, plant, and equipment, net before adjustment to net deferred profit	539.3	489.6
Net deferred profit on railcars sold to the Leasing Group	0	0
Property, plant, and equipment, net	539.3	489.6
Leasing Group | Wholly-owned subsidiaries
Components of property, plant, and equipment
Property, plant and equipment	3,672.2	3,438.9
Less: accumulated depreciation	(468.4)	(372.9)
Property, plant, and equipment, net before adjustment to net deferred profit	3,203.8	3,066.0
Net deferred profit on railcars sold to the Leasing Group	(381.8)	(344.5)
Property, plant, and equipment, net	2,822.0	2,721.5
Leasing Group | TRIP Holdings
Components of property, plant, and equipment
Property, plant and equipment	1,272.4	1,257.7
Less: accumulated depreciation	(153.8)	(122.7)
Property, plant, and equipment, net before adjustment to net deferred profit	1,118.6	1,135.0
Net deferred profit on railcars sold to the Leasing Group	(180.9)	(187.0)
Property, plant, and equipment, net	937.7	948.0
Land | Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	37.7	34.7
Buildings and improvements | Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	431.0	407.9
Machinery and other | Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	745.3	716.4
Machinery and other | Leasing Group | Wholly-owned subsidiaries
Components of property, plant, and equipment
Property, plant and equipment	9.6	9.6
Construction in progress | Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	46.1	12.7
Equipment on lease | Leasing Group | Wholly-owned subsidiaries
Components of property, plant, and equipment
Property, plant and equipment	$ 3,662.6	$ 3,429.3