Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 709.3us-gaap_ProfitLoss	$ 392.4us-gaap_ProfitLoss	$ 253.7us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Income from discontinued operations	0	(6.3)	(1.8)
Depreciation and amortization	244.6	211.5	193.7
Stock-based compensation expense	53.3us-gaap_ShareBasedCompensation	44.5us-gaap_ShareBasedCompensation	27.7us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation	(24.4)	(8.5)	(0.6)
Provision (benefit) for deferred income taxes	(5.8)us-gaap_DeferredIncomeTaxExpenseBenefit	45.8us-gaap_DeferredIncomeTaxExpenseBenefit	126.3us-gaap_DeferredIncomeTaxExpenseBenefit
Net gains on railcar lease fleet sales owned more than one year at the time of sale	(92.3)	(20.4)	(33.5)
Gain on disposition of property, plant, equipment, and other assets	(12.1)us-gaap_GainLossOnSaleOfOtherAssets	(0.8)us-gaap_GainLossOnSaleOfOtherAssets	(5.0)us-gaap_GainLossOnSaleOfOtherAssets
Non-cash interest expense	30.7	30.8	31.2
Other	(4.5)us-gaap_OtherNoncashIncomeExpense	(6.4)us-gaap_OtherNoncashIncomeExpense	(3.2)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities:
(Increase) decrease in receivables	(56.4)	17.2	2.7
(Increase) decrease in inventories	(186.3)us-gaap_IncreaseDecreaseInInventories	(95.6)us-gaap_IncreaseDecreaseInInventories	(128.0)us-gaap_IncreaseDecreaseInInventories
(Increase) decrease in restricted cash	25.0	(25.0)	0
(Increase) decrease in other assets	(8.3)	(29.1)	(41.5)
Increase (decrease) in accounts payable	60.7	29.0	(16.7)
Increase (decrease) in accrued liabilities	82.1	72.4	125.5
Increase (decrease) in other liabilities	2.6	8.2	(3.9)
Net cash provided by operating activities - continuing operations	818.2	659.7	526.6
Net cash provided by operating activities - discontinued operations	1.0	2.5	0.8
Net cash provided by operating activities	819.2	662.2	527.4
Investing activities:
(Increase) decrease in short-term marketable securities	74.7	(149.7)	0
Proceeds from railcar lease fleet sales owned more than one year at the time of sale	265.8	131.6	126.3
Proceeds from railcar lease fleet sales – sale and leaseback	0	0	58.3
Proceeds from disposition of property, plant, equipment, and other assets	23.0	3.7	16.8
Capital expenditures – leasing, net of sold lease fleet railcars owned one year or less with a net cost of $350.2, $49.4 and $93.8	(245.3)	(581.1)	(352.6)
Capital expenditures – manufacturing and other	(219.3)	(149.9)	(116.6)
Acquisitions, net of cash acquired	(714.4)	(73.2)	(46.2)
Other	0.8	0	1.7
Net cash required by investing activities - continuing operations	(814.7)	(818.6)	(312.3)
Net cash provided by investing activities - discontinued operations	0	0.6	0.9
Net cash required by investing activities	(814.7)	(818.0)	(311.4)
Financing activities:
Proceeds from issuance of common stock, net	0.6	2.5	4.1
Excess tax benefits from stock-based compensation	24.4	8.5	0.6
Payments to retire debt	(186.6)us-gaap_RepaymentsOfLongTermDebt	(262.1)us-gaap_RepaymentsOfLongTermDebt	(378.4)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of debt	727.3	175.0	443.8
(Increase) decrease in restricted cash	1.0	(12.5)	17.1
Shares repurchased	(36.5)	(103.2)	(45.2)
Dividends paid to common shareholders	(54.4)us-gaap_PaymentsOfDividendsCommonStock	(39.3)us-gaap_PaymentsOfDividendsCommonStock	(31.7)us-gaap_PaymentsOfDividendsCommonStock
Purchase of shares to satisfy employee tax on vested stock	(38.3)	(9.6)	(4.8)
Proceeds from sale of interests in partially-owned leasing subsidiaries	0	296.7	0
Repurchase of noncontrolling interests in partially-owned leasing subsidiary	0us-gaap_PaymentsToMinorityShareholders	(84.0)us-gaap_PaymentsToMinorityShareholders	0us-gaap_PaymentsToMinorityShareholders
Contributions from noncontrolling interest	49.6us-gaap_ProceedsFromContributedCapital	50.0us-gaap_ProceedsFromContributedCapital	0us-gaap_ProceedsFromContributedCapital
Distributions to noncontrolling interest	(28.2)	(10.0)	0
Other	(2.5)	0.8	(0.5)
Net cash provided by financing activities - continuing operations	456.4	12.8	5.0
Net cash provided (required) by financing activities - discontinued operations	(1.5)	(1.5)	0.9
Net cash provided by financing activities	454.9	11.3	5.9
Net increase (decrease) in cash and cash equivalents	459.4	(144.5)	221.9
Cash and cash equivalents at beginning of period	428.5	573.0	351.1
Cash and cash equivalents at end of period	887.9	428.5	573.0
Supplemental Cash Flow Information
Interest paid	158.3us-gaap_InterestPaid	163.6us-gaap_InterestPaid	174.8us-gaap_InterestPaid
Income tax payments made, net	$ 399.0us-gaap_IncomeTaxesPaidNet	$ 110.9us-gaap_IncomeTaxesPaidNet	$ 18.4us-gaap_IncomeTaxesPaidNet

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