Railcar Leasing and Management Services Group (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 788.6		$ 578.2
Property, plant, and equipment, net	5,143.8		5,320.3
Net deferred profit on railcars sold to the Leasing Group	(523.2)		(549.7)
Property, plant, and equipment, net	4,620.6	[1]	4,770.6
Restricted cash	231.4	[1]	260.7
Debt:
Less: unamortized discount	(70.6)	[1]	(74.1)
Total debt	2,940.2	[1]	2,989.8
Net deferred tax liabilities	642.9		639.4
Recourse
Debt:
Recourse	492.3		493.1
Less: unamortized discount	(70.6)		(74.1)
Total debt	421.7		419.0
Non-recourse
Debt:
Non-recourse	2,518.5		2,570.8
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	76.7	[1]	77.1
Leasing Group
Consolidating Financial Information
Net deferred profit on railcars sold to the Leasing Group	(523.2)		(549.7)
Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	2.0		3.5
Property, plant, and equipment, net	2,769.6		2,964.6
Restricted cash	154.7		183.6
Debt:
Total debt	1,320.6		1,356.9
Net deferred tax liabilities	646.3		671.9
Leasing Group | Wholly-owned subsidiaries | Recourse
Debt:
Recourse	41.4		42.2
Less: unamortized discount	0		0
Total debt	41.4		42.2
Leasing Group | Wholly-owned subsidiaries | Non-recourse
Debt:
Non-recourse	1,279.2		1,314.7
Leasing Group | Partially-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	0		0
Property, plant, and equipment, net	1,673.8		1,685.1
Restricted cash	76.7		77.1
Debt:
Total debt	1,239.3		1,256.1
Net deferred tax liabilities	0		0
Leasing Group | Partially-owned subsidiaries | Recourse
Debt:
Recourse	0		0
Less: unamortized discount	0		0
Total debt	0		0
Leasing Group | Partially-owned subsidiaries | Non-recourse
Debt:
Non-recourse	1,239.3		1,256.1
Manufacturing/Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	786.6		574.7
Property, plant, and equipment, net	700.4		670.6
Restricted cash	0		0
Debt:
Total debt	380.3		376.8
Net deferred tax liabilities	(3.4)		(32.5)
Manufacturing/Corporate | Recourse
Debt:
Recourse	450.9		450.9
Less: unamortized discount	(70.6)		(74.1)
Total debt	380.3		376.8
Manufacturing/Corporate | Non-recourse
Debt:
Non-recourse	$ 0		$ 0

[1] (unaudited)