Railcar Leasing and Management Services Group (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 663.7		$ 578.2
Property, plant, and equipment, net	5,411.4		5,320.3
Net deferred profit on railcars sold to the Leasing Group	(556.1)		(549.7)
Property, plant, and equipment, net	4,855.3	[1]	4,770.6
Restricted cash	237.9	[1]	260.7
Debt:
Less: unamortized discount	(63.7)	[1]	(74.1)
Total debt	3,595.6	[1]	2,989.8
Net deferred tax liabilities	600.2		639.4
Recourse
Debt:
Recourse	890.0		493.1
Less: unamortized discount	(63.7)		(74.1)
Total debt	826.3		419.0
Non-recourse
Debt:
Total debt	2,769.3		2,570.8
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	94.3	[1]	77.1
Leasing Group
Consolidating Financial Information
Net deferred profit on railcars sold to the Leasing Group	(556.1)		(549.7)
Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	2.3		3.5
Property, plant, and equipment, net	2,547.6		2,964.6
Restricted cash	143.6		183.6
Debt:
Total debt	1,270.5		1,356.9
Net deferred tax liabilities	601.3		671.9
Leasing Group | Wholly-owned subsidiaries | Recourse
Debt:
Recourse	39.8		42.2
Less: unamortized discount	0		0
Total debt	39.8		42.2
Leasing Group | Wholly-owned subsidiaries | Non-recourse
Debt:
Total debt	1,230.7		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	2,014.7		1,685.1
Restricted cash	94.3		77.1
Debt:
Total debt	1,538.6		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:
Total debt	1,538.6		1,256.1
Manufacturing/Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	661.4		574.7
Property, plant, and equipment, net	849.1		670.6
Restricted cash	0		0
Debt:
Total debt	786.5		376.8
Net deferred tax liabilities	(1.1)		(32.5)
Manufacturing/Corporate | Recourse
Debt:
Recourse	850.2		450.9
Less: unamortized discount	(63.7)		(74.1)
Total debt	786.5		376.8
Manufacturing/Corporate | Non-recourse
Debt:
Total debt	$ 0		$ 0

[1] (unaudited)