Railcar Leasing and Management Services Group (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 870.9	$ 962.9
Property, plant, and equipment, net	5,348.0	4,902.9
Restricted cash	195.8	234.7
Debt:
Recourse	885.7	889.3
Less: unamortized discount	(44.2)	(60.0)
Less: unamortized debt issuance costs	(4.8)	(5.7)
Recourse, net of unamortized discount and unamortized debt issuance costs	836.7	823.6
Non-recourse	2,390.7	2,723.7
Less: unamortized debt issuance costs	(32.0)	(32.8)
Non-recourse debt, net of unamortized debt issuance costs	2,358.7	2,690.9
Total debt	3,195.4	3,514.5
Net deferred tax liabilities	734.8	615.0
Wholly-owned subsidiaries
Debt:
Non-recourse debt, net of unamortized debt issuance costs	928.7	1,194.0
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	89.9	91.9
Debt:
Non-recourse debt, net of unamortized debt issuance costs	1,430.0	1,496.9
Leasing Group
Debt:
Non-recourse debt, net of unamortized debt issuance costs	2,358.7	2,690.9
Leasing Group | Wholly-owned subsidiaries
Debt:
Non-recourse	943.8	1,207.8
Less: unamortized debt issuance costs	(15.1)	(13.8)
Non-recourse debt, net of unamortized debt issuance costs	928.7	1,194.0
Leasing Group | Partially-owned subsidiaries
Debt:
Non-recourse	1,446.9	1,515.9
Less: unamortized debt issuance costs	(16.9)	(19.0)
Non-recourse debt, net of unamortized debt issuance costs	1,430.0	1,496.9
Operating Segments
Consolidating Financial Information
Property, plant, and equipment, net	6,021.0	5,460.1
Operating Segments | Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	3.8	11.9
Property, plant, and equipment, net	3,126.3	2,599.2
Restricted cash	105.9	142.8
Debt:
Recourse	35.8	39.1
Less: unamortized discount	0.0	0.0
Less: unamortized debt issuance costs	(0.1)	(0.2)
Recourse, net of unamortized discount and unamortized debt issuance costs	35.7	38.9
Non-recourse	943.8	1,207.8
Less: unamortized debt issuance costs	(15.1)	(13.8)
Non-recourse debt, net of unamortized debt issuance costs	928.7	1,194.0
Total debt	964.4	1,232.9
Net deferred tax liabilities	746.0	658.2
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	1,938.6	1,999.9
Restricted cash	89.9	91.9
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 and unamortized debt issuance costs	0.0	0.0
Non-recourse	1,446.9	1,515.9
Less: unamortized debt issuance costs	(16.9)	(19.0)
Non-recourse debt, net of unamortized debt issuance costs	1,430.0	1,496.9
Total debt	1,430.0	1,496.9
Net deferred tax liabilities	1.4	0.9
Manufacturing/ Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	867.1	951.0
Property, plant, and equipment, net	956.1	861.0
Restricted cash	0.0	0.0
Debt:
Recourse	849.9	850.2
Less: unamortized discount	(44.2)	(60.0)
Less: unamortized debt issuance costs	(4.7)	(5.5)
Recourse, net of unamortized discount and unamortized debt issuance costs	801.0	784.7
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	801.0	784.7
Net deferred tax liabilities	(12.6)	(44.1)
Intersegment
Consolidating Financial Information
Property, plant, and equipment, net	$ (673.0)	$ (557.2)