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Derivative Instruments and Fair Value Accounting Derivative Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 2,529.6 | $ 2,565.1 | $ 2,562.0 | $ 4,671.8 | $ 4,834.6 | $ 4,858.0
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2006 Secured Railcar Equipment Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 200.0 |  |  |  |  |
Derivative, Average Fixed Interest Rate | 4.87% |  |  |  |  |
Derivative Liability | $ 0.0 |  |  |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 249.3 |  |  |  |  |
Derivative, Average Fixed Interest Rate | 4.41% |  |  |  |  |
Derivative Liability | $ 0.0 |  |  |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 788.5 |  |  |  |  |
Derivative, Average Fixed Interest Rate | 3.60% |  |  |  |  |
Derivative Liability | $ 0.0 |  |  |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap, Open, TRIP Master Funding Secured Railcar Equipment Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 34.8 |  |  |  |  |
Derivative, Average Fixed Interest Rate | 2.62% |  |  |  |  |
Derivative Liability | $ 0.0 |  |  |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 169.3 |  |  |  |  |
Derivative, Cap Interest Rate | 3.00% |  |  |  |  |
Derivative Liability | $ 0.0 |  |  |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 586.2 |  |  |  |  |
Derivative, Cap Interest Rate | 2.68% |  |  |  |  |
Derivative Liability | $ (29.2) |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (20.5) |  | $ (8.3) |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2006 Secured Railcar Equipment Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (0.2) |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1.2 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 2.6 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Open, TRIP Master Funding Secured Railcar Equipment Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 0.2 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (0.7) |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 29.2 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2006 Secured Railcar Equipment Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 0.0 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 0.0 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 3.6 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Open, TRIP Master Funding Secured Railcar Equipment Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 0.2 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 0.0 |  |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 0.0 |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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