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Acquisitions - Additional Information (Details) shares in Millions |  |  |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2017 USD ($) | Mar. 06, 2017 USD ($) | Feb. 03, 2017 USD ($) | Nov. 30, 2016 USD ($) employee country | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 21, 2017 USD ($) shares | Jun. 30, 2017 USD ($) | Apr. 05, 2017 USD ($) | Mar. 14, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 14, 2016 USD ($) | Nov. 30, 2016 € / shares | Nov. 17, 2016 USD ($) | Aug. 01, 2016 USD ($) | May 05, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposits |  |  |  |  | $ 0 |  |  | $ 0 |  |  | $ 744,748,000 |  |  |  |  |
Adjustment to preliminary purchase allocation |  |  |  |  |  |  |  | 79,855,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 2,343,608,000 |  |  | 2,343,608,000 |  |  | 2,078,765,000 |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | 668,900,000 |  |  | 668,900,000 |  |  |  |  |  |  |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | 307,100,000 |  |  | $ 307,100,000 |  |  |  |  |  |  |  |
Intangible assets, weighted average useful life (years) |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Noncompete Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, weighted average useful life (years) |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Intellectual Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | 5,000,000 |  |  | $ 5,000,000 |  |  |  |  |  |  |  |
Intangible assets, weighted average useful life (years) |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | 355,100,000 |  |  | $ 355,100,000 |  |  |  |  |  |  |  |
Faiveley Transport |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Faiveley |  |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of employees (more than) | employee |  |  |  | 5,700 |  |  |  |  |  |  |  |  |  |  |  |
Number of countries Faiveley operates in | country |  |  |  | 24 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per share (in euros per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  | € 100 |  |  |
Outstanding share capital acquired (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |
Percentage of voting interests in Faiveley (as a percent) | 100.00% | 22.00% | 27.00% |  |  |  | 100.00% |  |  |  |  |  | 49.00% |  |  |
Share conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  | 1.1538 |  |  |
Additional share capital acquired (as a percent) |  | 21.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for acquisition | $ 17,500,000 | $ 303,200,000 | $ 411,800,000 |  |  |  | $ 944,300,000 |  |  |  |  |  |  |  |  |
Equity issued in acquisition |  | $ 300,000 | $ 25,200,000 |  |  |  | $ 560,200,000 |  |  |  |  |  |  |  |  |
Cumulative share capital acquired (as a percent) | 100.00% | 99.00% | 78.00% |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Cumulative voting rights acquired (as a percent) | 100.00% | 98.00% | 76.00% |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  |  |  |  |  | $ 1,736,100,000 |  |  |  |  |  |  |  |  |
Equity issued in acquisition (in shares) | shares |  |  |  |  |  |  | 6.6 |  |  |  |  |  |  |  |  |
Debt assumed in acquisition |  |  |  |  |  |  | $ 409,900,000 |  |  |  |  |  |  |  |  |
Cash acquired in acquisition |  |  |  |  |  |  | 178,300,000 |  |  |  |  |  |  |  |  |
Escrow deposits |  |  |  |  |  |  |  |  |  |  | $ 744,700,000 |  |  |  |  |
Acquisition of noncontrolling interest |  |  |  |  |  | $ 8,900,000 |  |  |  |  |  |  |  |  |  |
Adjustment to current liabilities acquired |  |  |  |  |  |  |  | 51,500,000 |  |  |  |  |  |  |  |
Accounts receivable | $ 445,164,000 |  |  |  |  |  | 445,164,000 |  |  |  |  |  |  |  |  |
Current liabilities | 805,728,000 |  |  |  |  |  | 805,728,000 |  |  |  |  |  |  |  |  |
Adjustment to other noncurrent assets |  |  |  |  |  |  |  | 23,400,000 |  |  |  |  |  |  |  |
Adjustment to preliminary purchase allocation |  |  |  |  |  |  |  | 68,600,000 |  |  |  |  |  |  |  |
Accrued share based compensation acquired in acquisition |  |  |  |  | 25,900,000 |  |  | 25,900,000 |  |  |  |  |  |  |  |
Revenue reported by acquired entity |  |  |  |  | 282,700,000 |  |  | 557,400,000 |  |  |  |  |  |  |  |
Goodwill | $ 1,256,855,000 |  |  |  |  |  | $ 1,256,855,000 |  |  |  |  |  |  |  |  |
Faiveley Transport | Restatement Adjustment | Fair Value of Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | 2,800,000 |  |  | 2,800,000 |  |  |  |  |  |  |  |
Faiveley Transport | Restatement Adjustment | Fair Value of Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  | 36,200,000 |  |  | 36,200,000 |  |  |  |  |  |  |  |
Faiveley Transport | Restatement Adjustment | Fair Value of Assets Acquired and Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | 64,300,000 |  |  | 64,300,000 |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  | $ 64,300,000 |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquisition consideration payable in cash (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Faiveley Transport | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquisition consideration payable in cash (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |
Acquisitions other than Faiveley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposits |  |  |  |  | $ 38,400,000 |  |  | $ 38,400,000 |  |  |  |  |  |  |  |
TTC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  | $ 32,511,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 21,122,000 |  |  |  |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  | $ 21,100,000.0 |  |  |  |  |  |  |
ATP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 65,254,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 41,036,000 |  |  |  |  |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Workhorse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | $ 43,827,000 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 24,373,000 |  |  |  |
Goodwill deductible for taxes (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 37.80% |  |  |  |
Precision Turbo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,826,000 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,959,000 |  |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,900,000 |  |
Unitrac |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,771,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,442,000
Goodwill tax deduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000
Gerken |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,847,000 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,470,000 |
Goodwill tax deduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition. + References No definition available. + Details
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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial assets acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=SL65897772-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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