Railcar Leasing and Management Services Group (Details) - USD ($) $ in Millions	Mar. 31, 2017		Dec. 31, 2016
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 778.8		$ 798.1
Property, plant, and equipment, net	6,080.1	[1]	5,966.8
Restricted cash	183.8	[1]	178.2
Debt:
Recourse	880.6		881.5
Less: unamortized discount	(22.5)	[1]	(27.1)
Less: unamortized debt issuance costs	(3.6)		(3.8)
Recourse, net of unamortized discount and unamortized debt issuance costs	854.5	[1]	850.6
Non-recourse	2,206.6		2,232.4
Less: unamortized debt issuance costs	(25.1)		(26.4)
Non-recourse debt, net of unamortized debt issuance costs	2,181.5		2,206.0
Total debt	3,036.0	[1]	3,056.6
Net deferred tax liabilities	1,112.6		1,057.0
Wholly-owned subsidiaries
Debt:
Non-recourse debt, net of unamortized debt issuance costs	827.8	[1]	840.0
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	83.4	[1]	78.4
Debt:
Non-recourse debt, net of unamortized debt issuance costs	1,353.7	[1]	1,366.0
Manufacturing/ Corporate
Consolidating Financial Information
Property, plant, and equipment, net	956.0		961.7
Leasing Group
Debt:
Non-recourse debt, net of unamortized debt issuance costs	2,181.5		2,206.0
Leasing Group | Wholly-owned subsidiaries
Debt:
Non-recourse	838.3		851.4
Less: unamortized debt issuance costs	(10.5)		(11.4)
Non-recourse debt, net of unamortized debt issuance costs	827.8		840.0
Leasing Group | Partially-owned subsidiaries
Debt:
Non-recourse	1,368.3		1,381.0
Less: unamortized debt issuance costs	(14.6)		(15.0)
Non-recourse debt, net of unamortized debt issuance costs	1,353.7		1,366.0
Operating Segments
Consolidating Financial Information
Property, plant, and equipment, net	6,899.7		6,764.9
Operating Segments | Manufacturing/ Corporate
Consolidating Financial Information
Property, plant, and equipment, net	956.0		961.7
Operating Segments | Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	6.9		7.2
Property, plant, and equipment, net	4,079.8		3,923.6
Restricted cash	100.3		99.7
Debt:
Recourse	31.2		32.1
Less: unamortized discount	0.0		0.0
Less: unamortized debt issuance costs	(0.1)		(0.1)
Recourse, net of unamortized discount and unamortized debt issuance costs	31.1		32.0
Non-recourse	838.3		851.4
Less: unamortized debt issuance costs	(10.5)		(11.4)
Non-recourse debt, net of unamortized debt issuance costs	827.8		840.0
Total debt	858.9		872.0
Net deferred tax liabilities	992.1		956.6
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	1,863.9		1,879.6
Restricted cash	83.4		78.4
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	1,368.3		1,381.0
Less: unamortized debt issuance costs	(14.6)		(15.0)
Non-recourse debt, net of unamortized debt issuance costs	1,353.7		1,366.0
Total debt	1,353.7		1,366.0
Net deferred tax liabilities	2.0		2.0
Operating Segments | Manufacturing/ Corporate | Manufacturing/ Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	771.9		790.9
Restricted cash	0.1		0.1
Debt:
Recourse	849.4		849.4
Less: unamortized discount	(22.5)		(27.1)
Less: unamortized debt issuance costs	(3.5)		(3.7)
Recourse, net of unamortized discount and unamortized debt issuance costs	823.4		818.6
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	823.4		818.6
Net deferred tax liabilities	118.5		98.4
Net deferred profit on railcars sold to the Leasing Group
Consolidating Financial Information
Property, plant, and equipment, net	$ (819.6)		$ (798.1)

[1] (unaudited)