Railcar Leasing and Management Services Group (Details) - USD ($) $ in Millions	Jun. 30, 2015		Dec. 31, 2014
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 583.8		$ 962.9
Property, plant, and equipment, net	5,804.9		5,460.1
Net deferred profit on railcars sold to the Leasing Group	(611.0)		(557.2)
Property, plant, and equipment, net	5,193.9	[1]	4,902.9
Restricted cash	197.3	[1]	234.7
Debt:
Less: unamortized discount	(52.3)	[1]	(60.0)
Total debt	3,340.3	[1]	3,553.0
Net deferred tax liabilities	629.4		615.0
Recourse
Debt:
Recourse	887.7		889.3
Less: unamortized discount	(52.3)		(60.0)
Total debt	835.4		829.3
Non-recourse
Debt:
Total debt	2,504.9		2,723.7
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	92.4	[1]	91.9
Leasing Group
Consolidating Financial Information
Net deferred profit on railcars sold to the Leasing Group	(611.0)		(557.2)
Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	3.6		11.9
Property, plant, and equipment, net	2,919.7		2,599.2
Restricted cash	104.9		142.8
Debt:
Total debt	1,061.5		1,246.9
Net deferred tax liabilities	652.1		658.2
Leasing Group | Wholly-owned subsidiaries | Recourse
Debt:
Recourse	37.5		39.1
Less: unamortized discount	0.0		0.0
Total debt	37.5		39.1
Leasing Group | Wholly-owned subsidiaries | Non-recourse
Debt:
Total debt	1,024.0		1,207.8
Leasing Group | Partially-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	0.0		0.0
Property, plant, and equipment, net	1,966.0		1,999.9
Restricted cash	92.4		91.9
Debt:
Total debt	1,480.9		1,515.9
Net deferred tax liabilities	0.9		0.9
Leasing Group | Partially-owned subsidiaries | Recourse
Debt:
Recourse	0.0		0.0
Less: unamortized discount	0.0		0.0
Total debt	0.0		0.0
Leasing Group | Partially-owned subsidiaries | Non-recourse
Debt:
Total debt	1,480.9		1,515.9
Manufacturing/Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	580.2		951.0
Property, plant, and equipment, net	919.2		861.0
Restricted cash	0.0		0.0
Debt:
Total debt	797.9		790.2
Net deferred tax liabilities	(23.6)		(44.1)
Manufacturing/Corporate | Recourse
Debt:
Recourse	850.2		850.2
Less: unamortized discount	(52.3)		(60.0)
Total debt	797.9		790.2
Manufacturing/Corporate | Non-recourse
Debt:
Total debt	$ 0.0		$ 0.0

[1] (unaudited)