Railcar Leasing and Management Services Group (Details) - USD ($) $ in Millions	Mar. 31, 2016		Dec. 31, 2015
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 835.6		$ 870.9
Property, plant, and equipment, net	5,523.5	[1]	5,348.0
Restricted cash	185.6	[1]	195.8
Debt:
Recourse	884.9		885.7
Less: unamortized discount	(40.0)	[1]	(44.2)
Less: unamortized debt issuance costs	(4.5)		(4.8)
Recourse, net of unamortized discount of $40.0 and $44.2	840.4	[1]	836.7
Non-recourse	2,361.1		2,390.7
Less: unamortized debt issuance costs	(30.5)		(32.0)
Non-recourse debt, net of unamortized debt issuance costs	2,330.6		2,358.7
Total debt	3,171.0	[1]	3,195.4
Net deferred tax liabilities	796.0		734.8
Wholly-owned subsidiaries
Debt:
Non-recourse debt, net of unamortized debt issuance costs	917.5	[1]	928.7
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	83.6	[1]	89.9
Debt:
Non-recourse debt, net of unamortized debt issuance costs	1,413.1	[1]	1,430.0
Leasing Group
Debt:
Non-recourse debt, net of unamortized debt issuance costs	2,330.6		2,358.7
Leasing Group | Wholly-owned subsidiaries
Debt:
Non-recourse	931.6		943.8
Less: unamortized debt issuance costs	(14.1)		(15.1)
Non-recourse debt, net of unamortized debt issuance costs	917.5		928.7
Leasing Group | Partially-owned subsidiaries
Debt:
Non-recourse	1,429.5		1,446.9
Less: unamortized debt issuance costs	(16.4)		(16.9)
Non-recourse debt, net of unamortized debt issuance costs	1,413.1		1,430.0
Operating Segments
Consolidating Financial Information
Property, plant, and equipment, net	6,254.3		6,021.0
Operating Segments | Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	6.6		3.8
Property, plant, and equipment, net	3,380.1		3,126.3
Restricted cash	102.0		105.9
Debt:
Recourse	35.0		35.8
Less: unamortized discount	0.0		0.0
Less: unamortized debt issuance costs	(0.1)		(0.1)
Recourse, net of unamortized discount of $40.0 and $44.2	34.9		35.7
Non-recourse	931.6		943.8
Less: unamortized debt issuance costs	(14.1)		(15.1)
Non-recourse debt, net of unamortized debt issuance costs	917.5		928.7
Total debt	952.4		964.4
Net deferred tax liabilities	794.7		746.0
Operating Segments | 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	1,923.7		1,938.6
Restricted cash	83.6		89.9
Debt:
Recourse	0.0		0.0
Less: unamortized discount	0.0		0.0
Less: unamortized debt issuance costs	0.0		0.0
Recourse, net of unamortized discount of $40.0 and $44.2	0.0		0.0
Non-recourse	1,429.5		1,446.9
Less: unamortized debt issuance costs	(16.4)		(16.9)
Non-recourse debt, net of unamortized debt issuance costs	1,413.1		1,430.0
Total debt	1,413.1		1,430.0
Net deferred tax liabilities	1.4		1.4
Manufacturing/ Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	829.0		867.1
Property, plant, and equipment, net	950.5		956.1
Restricted cash	0.0		0.0
Debt:
Recourse	849.9		849.9
Less: unamortized discount	(40.0)		(44.2)
Less: unamortized debt issuance costs	(4.4)		(4.7)
Recourse, net of unamortized discount of $40.0 and $44.2	805.5		801.0
Non-recourse	0.0		0.0
Less: unamortized debt issuance costs	0.0		0.0
Non-recourse debt, net of unamortized debt issuance costs	0.0		0.0
Total debt	805.5		801.0
Net deferred tax liabilities	(0.1)		(12.6)
Net deferred profit on railcars sold to the Leasing Group
Consolidating Financial Information
Property, plant, and equipment, net	$ (730.8)		$ (673.0)

[1] (unaudited)