Financial Statements for Guarantors of the Senior Notes (Details 2) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Operating activities:
Net income	$ 212.2		$ 156.9	$ 622.0		$ 563.0
Equity in earnings of subsidiaries, net of taxes	0.0		0.0	0.0		0.0
Other				8.3		(230.4)
Net cash provided (required) by operating activities				630.3		332.6
Investing activities:
(Increase) decrease in short-term marketable securities				75.0		149.7
Proceeds from dispositions of property				6.1		21.9
Proceeds from railcar lease fleet sales				313.4		257.4
Capital expenditures – leasing				(642.2)		(170.4)
Capital expenditures – manufacturing and other				(145.1)		(170.0)
Acquisitions, net of cash acquired	0.0		(593.0)	(46.2)		(711.8)
(Increase) decrease in investment in partially-owned subsidiaries				0.0		0.0
Divestitures				51.3		0.0
Other				4.8		2.0
Net cash provided (required) by investing activities				(382.9)		(621.2)
Financing activities:
Proceeds from issuance of common stock, net				0.2		0.6
Excess tax benefits from stock-based compensation				13.1		24.2
Payments to retire debt				(530.8)		(140.2)
Proceeds from issuance of debt				242.4		727.4
(Increase) decrease in restricted cash				32.3		(2.2)
Shares repurchased				(107.5)		(36.5)
Dividends paid to common shareholders				(48.0)		(38.7)
Purchase of shares to satisfy employee tax on vested stock				(27.4)		(38.5)
Contributions from noncontrolling interest				0.0		49.6
Contributions from controlling interest in partially-owned subsidiaries				0.0		0.0
Distributions to noncontrolling interest				(30.4)		(19.3)
Distributions to controlling interest in partially-owned subsidiaries				0.0		0.0
Change in intercompany financing between entities				0.0		0.0
Other				(1.4)		(2.6)
Net cash provided (required) by financing activities				(457.5)		523.8
Net (decrease) increase in cash and cash equivalents				(210.1)		235.2
Cash and cash equivalents at beginning of period				887.9		428.5
Cash and cash equivalents at end of period	677.8	[1]	663.7	677.8	[1]	663.7
Reportable legal entities | Parent
Operating activities:
Net income	204.3		149.4	596.5		540.0
Equity in earnings of subsidiaries, net of taxes	(283.3)		(211.1)	(726.4)		(616.5)
Other				20.5		71.9
Net cash provided (required) by operating activities				(109.4)		(4.6)
Investing activities:
(Increase) decrease in short-term marketable securities				75.0		149.7
Proceeds from dispositions of property				0.0		0.4
Proceeds from railcar lease fleet sales				0.0		0.0
Capital expenditures – leasing				0.0		0.0
Capital expenditures – manufacturing and other				(8.4)		(7.8)
Acquisitions, net of cash acquired				0.0		0.0
(Increase) decrease in investment in partially-owned subsidiaries				0.0		0.0
Divestitures				0.0		0.0
Other				0.0		0.0
Net cash provided (required) by investing activities				66.6		142.3
Financing activities:
Proceeds from issuance of common stock, net				0.2		0.6
Excess tax benefits from stock-based compensation				13.1		24.2
Payments to retire debt				0.0		(0.4)
Proceeds from issuance of debt				(1.5)		395.4
(Increase) decrease in restricted cash				0.0		0.0
Shares repurchased				(107.5)		(36.5)
Dividends paid to common shareholders				(48.0)		(38.7)
Purchase of shares to satisfy employee tax on vested stock				(27.3)		(38.5)
Contributions from noncontrolling interest				0.0		0.0
Contributions from controlling interest in partially-owned subsidiaries				0.0		0.0
Distributions to noncontrolling interest				0.0		0.0
Distributions to controlling interest in partially-owned subsidiaries				0.0		0.0
Change in intercompany financing between entities				36.6		(214.2)
Other				0.0		0.0
Net cash provided (required) by financing activities				(134.4)		91.9
Net (decrease) increase in cash and cash equivalents				(177.2)		229.6
Cash and cash equivalents at beginning of period				827.7		409.8
Cash and cash equivalents at end of period	650.5		639.4	650.5		639.4
Reportable legal entities | Combined Guarantor Subsidiaries
Operating activities:
Net income	208.1		173.3	583.9		505.8
Equity in earnings of subsidiaries, net of taxes	(56.9)		(28.1)	(181.5)		(104.5)
Other				(81.2)		(398.3)
Net cash provided (required) by operating activities				321.2		3.0
Investing activities:
(Increase) decrease in short-term marketable securities				0.0		0.0
Proceeds from dispositions of property				1.9		0.0
Proceeds from railcar lease fleet sales				142.1		549.0
Capital expenditures – leasing				(638.1)		(164.3)
Capital expenditures – manufacturing and other				(30.9)		(100.5)
Acquisitions, net of cash acquired				0.0		(593.0)
(Increase) decrease in investment in partially-owned subsidiaries				19.3		(10.2)
Divestitures				0.0		0.0
Other				0.9		1.5
Net cash provided (required) by investing activities				(504.8)		(317.5)
Financing activities:
Proceeds from issuance of common stock, net				0.0		0.0
Excess tax benefits from stock-based compensation				0.0		0.0
Payments to retire debt				(2.5)		(2.4)
Proceeds from issuance of debt				0.0		(0.1)
(Increase) decrease in restricted cash				0.0		0.0
Shares repurchased				0.0		0.0
Dividends paid to common shareholders				0.0		0.0
Purchase of shares to satisfy employee tax on vested stock				0.0		0.0
Contributions from noncontrolling interest				0.0		0.0
Contributions from controlling interest in partially-owned subsidiaries				0.0		0.0
Distributions to noncontrolling interest				0.0		0.0
Distributions to controlling interest in partially-owned subsidiaries				0.0		0.0
Change in intercompany financing between entities				175.5		317.2
Other				0.0		(0.5)
Net cash provided (required) by financing activities				173.0		314.2
Net (decrease) increase in cash and cash equivalents				(10.6)		(0.3)
Cash and cash equivalents at beginning of period				11.1		2.1
Cash and cash equivalents at end of period	0.5		1.8	0.5		1.8
Reportable legal entities | Combined Non-Guarantor Subsidiaries
Operating activities:
Net income	92.1		68.5	295.0		224.7
Equity in earnings of subsidiaries, net of taxes	0.0		0.0	0.0		0.0
Other				93.8		106.5
Net cash provided (required) by operating activities				388.8		331.2
Investing activities:
(Increase) decrease in short-term marketable securities				0.0		0.0
Proceeds from dispositions of property				4.2		21.5
Proceeds from railcar lease fleet sales				214.5		132.2
Capital expenditures – leasing				(47.3)		(429.9)
Capital expenditures – manufacturing and other				(105.8)		(61.7)
Acquisitions, net of cash acquired				(46.2)		(118.8)
(Increase) decrease in investment in partially-owned subsidiaries				0.0		0.0
Divestitures				51.3		0.0
Other				3.9		0.5
Net cash provided (required) by investing activities				74.6		(456.2)
Financing activities:
Proceeds from issuance of common stock, net				0.0		0.0
Excess tax benefits from stock-based compensation				0.0		0.0
Payments to retire debt				(528.3)		(137.4)
Proceeds from issuance of debt				243.9		332.1
(Increase) decrease in restricted cash				27.7		6.7
Shares repurchased				0.0		0.0
Dividends paid to common shareholders				0.0		0.0
Purchase of shares to satisfy employee tax on vested stock				0.0		0.0
Contributions from noncontrolling interest				0.0		49.6
Contributions from controlling interest in partially-owned subsidiaries				0.0		22.2
Distributions to noncontrolling interest				(30.4)		(19.3)
Distributions to controlling interest in partially-owned subsidiaries				(19.3)		(12.0)
Change in intercompany financing between entities				(182.4)		(99.9)
Other				(1.5)		(2.1)
Net cash provided (required) by financing activities				(490.3)		139.9
Net (decrease) increase in cash and cash equivalents				(26.9)		14.9
Cash and cash equivalents at beginning of period				89.4		44.0
Cash and cash equivalents at end of period	62.5		58.9	62.5		58.9
Eliminations
Operating activities:
Net income	(292.3)		(234.3)	(853.4)		(707.5)
Equity in earnings of subsidiaries, net of taxes	340.2		239.2	907.9		721.0
Other				(24.8)		(10.5)
Net cash provided (required) by operating activities				29.7		3.0
Investing activities:
(Increase) decrease in short-term marketable securities				0.0		0.0
Proceeds from dispositions of property				0.0		0.0
Proceeds from railcar lease fleet sales				(43.2)		(423.8)
Capital expenditures – leasing				43.2		423.8
Capital expenditures – manufacturing and other				0.0		0.0
Acquisitions, net of cash acquired				0.0		0.0
(Increase) decrease in investment in partially-owned subsidiaries				(19.3)		10.2
Divestitures				0.0		0.0
Other				0.0		0.0
Net cash provided (required) by investing activities				(19.3)		10.2
Financing activities:
Proceeds from issuance of common stock, net				0.0		0.0
Excess tax benefits from stock-based compensation				0.0		0.0
Payments to retire debt				0.0		0.0
Proceeds from issuance of debt				0.0		0.0
(Increase) decrease in restricted cash				4.6		(8.9)
Shares repurchased				0.0		0.0
Dividends paid to common shareholders				0.0		0.0
Purchase of shares to satisfy employee tax on vested stock				0.0		0.0
Contributions from noncontrolling interest				0.0		0.0
Contributions from controlling interest in partially-owned subsidiaries				0.0		(22.2)
Distributions to noncontrolling interest				0.0		0.0
Distributions to controlling interest in partially-owned subsidiaries				19.3		12.0
Change in intercompany financing between entities				(29.7)		(3.1)
Other				0.0		0.0
Net cash provided (required) by financing activities				(5.8)		(22.2)
Net (decrease) increase in cash and cash equivalents				4.6		(9.0)
Cash and cash equivalents at beginning of period				(40.3)		(27.4)
Cash and cash equivalents at end of period	$ (35.7)		$ (36.4)	$ (35.7)		$ (36.4)

[1] (unaudited)