Property, Plant, and Equipment (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Components of property, plant, and equipment
Less accumulated depreciation	$ (1,352.8)	[1]	$ (1,228.4)
Property plant and equipment net before adjustment to Net deferred profit	4,819.0		4,711.0
Net deferred profit on railcars sold to the Leasing Group	(535.3)		(531.5)
Property, plant and equipment, total	4,283.7	[1]	4,179.5
TRIP Holdings
Components of property, plant, and equipment
Less accumulated depreciation	(145.2)	[1]	(122.7)
Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	1,278.5		1,242.8
Less accumulated depreciation	(761.9)		(732.8)
Property plant and equipment net before adjustment to Net deferred profit	516.6		510.0
Net deferred profit on railcars sold to the Leasing Group	0		0
Property, plant and equipment, total	516.6		510.0
Leasing Group | Wholly-owned subsidiaries
Components of property, plant, and equipment
Property, plant and equipment	3,621.0		3,438.9
Less accumulated depreciation	(445.7)		(372.9)
Property plant and equipment net before adjustment to Net deferred profit	3,175.3		3,066.0
Net deferred profit on railcars sold to the Leasing Group	(352.8)		(344.5)
Property, plant and equipment, total	2,822.5		2,721.5
Leasing Group | TRIP Holdings
Components of property, plant, and equipment
Property, plant and equipment	1,272.3		1,257.7
Less accumulated depreciation	(145.2)		(122.7)
Property plant and equipment net before adjustment to Net deferred profit	1,127.1		1,135.0
Net deferred profit on railcars sold to the Leasing Group	(182.5)		(187.0)
Property, plant and equipment, total	944.6		948.0
Land | Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	40.2		41.6
Buildings and improvements | Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	438.6		429.7
Machinery and other | Manufacturing/Corporate
Components of property, plant, and equipment
Property, plant and equipment	764.1		758.7
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	35.6		12.8
Equipment on lease | Leasing Group | Wholly-owned subsidiaries
Components of property, plant, and equipment
Property, plant and equipment	$ 3,611.4		$ 3,429.3

[1] (unaudited)