Railcar Leasing and Management Services Group (Details) - USD ($) $ in Millions	Sep. 30, 2016		Dec. 31, 2015
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 842.5		$ 870.9
Property, plant, and equipment, net	5,763.2	[1]	5,348.0
Restricted cash	183.9	[1]	195.8
Debt:
Recourse	882.9		885.7
Less: unamortized discount	(31.5)	[1]	(44.2)
Less: unamortized debt issuance costs	(4.0)		(4.8)
Recourse, net of unamortized discount of $31.5 and $44.2	847.4	[1]	836.7
Non-recourse	2,287.4		2,390.7
Less: unamortized debt issuance costs	(27.7)		(32.0)
Non-recourse debt, net of unamortized debt issuance costs	2,259.7		2,358.7
Total debt	3,107.1	[1]	3,195.4
Net deferred tax liabilities	918.5		734.8
Wholly-owned subsidiaries
Debt:
Non-recourse debt, net of unamortized debt issuance costs	880.7	[1]	928.7
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	81.7	[1]	89.9
Debt:
Non-recourse debt, net of unamortized debt issuance costs	1,379.0	[1]	1,430.0
Manufacturing/ Corporate
Consolidating Financial Information
Property, plant, and equipment, net	958.5		956.1
Leasing Group
Debt:
Non-recourse debt, net of unamortized debt issuance costs	2,259.7		2,358.7
Leasing Group | Wholly-owned subsidiaries
Debt:
Non-recourse	893.0		943.8
Less: unamortized debt issuance costs	(12.3)		(15.1)
Non-recourse debt, net of unamortized debt issuance costs	880.7		928.7
Leasing Group | Partially-owned subsidiaries
Debt:
Non-recourse	1,394.4		1,446.9
Less: unamortized debt issuance costs	(15.4)		(16.9)
Non-recourse debt, net of unamortized debt issuance costs	1,379.0		1,430.0
Operating Segments
Consolidating Financial Information
Property, plant, and equipment, net	6,529.5		6,021.0
Operating Segments | Manufacturing/ Corporate
Consolidating Financial Information
Property, plant, and equipment, net	958.5		956.1
Operating Segments | Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	5.8		3.8
Property, plant, and equipment, net	3,677.0		3,126.3
Restricted cash	102.1		105.9
Debt:
Recourse	33.2		35.8
Less: unamortized discount	0.0		0.0
Less: unamortized debt issuance costs	(0.1)		(0.1)
Recourse, net of unamortized discount of $31.5 and $44.2	33.1		35.7
Non-recourse	893.0		943.8
Less: unamortized debt issuance costs	(12.3)		(15.1)
Non-recourse debt, net of unamortized debt issuance costs	880.7		928.7
Total debt	913.8		964.4
Net deferred tax liabilities	878.8		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	1,894.0		1,938.6
Restricted cash	81.7		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 $31.5 and $44.2	0.0		0.0
Non-recourse	1,394.4		1,446.9
Less: unamortized debt issuance costs	(15.4)		(16.9)
Non-recourse debt, net of unamortized debt issuance costs	1,379.0		1,430.0
Total debt	1,379.0		1,430.0
Net deferred tax liabilities	1.4		1.4
Operating Segments | Manufacturing/ Corporate | Manufacturing/ Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	836.7		867.1
Restricted cash	0.1		0.0
Debt:
Recourse	849.7		849.9
Less: unamortized discount	(31.5)		(44.2)
Less: unamortized debt issuance costs	(3.9)		(4.7)
Recourse, net of unamortized discount of $31.5 and $44.2	814.3		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	814.3		801.0
Net deferred tax liabilities	38.3		(12.6)
Net deferred profit on railcars sold to the Leasing Group
Consolidating Financial Information
Property, plant, and equipment, net	$ (766.3)		$ (673.0)

[1] (unaudited)