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ACQUISITIONS - Narrative (FY) (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2017 USD ($) | Mar. 06, 2017 USD ($) | Feb. 03, 2017 USD ($) | Nov. 30, 2016 USD ($) Country Employee | Mar. 31, 2017 USD ($) | Mar. 21, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 04, 2017 USD ($) | Oct. 02, 2017 USD ($) | Apr. 05, 2017 USD ($) | Mar. 14, 2017 USD ($) | Mar. 13, 2017 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for acquisition |  |  |  |  |  |  |  | $ 1,006,207 | $ 904,695 | $ 135,231 |  |  |  |  |  |  |  |  |  |
Stock used for acquisition |  |  |  |  |  |  |  | 25,500 | 534,679 | 0 |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  |  |  | 35,408 | 186,903 | $ 5,681 |  |  |  |  |  |  |  |  |  |
Deposit in escrow |  |  |  |  |  |  |  | 0 | 744,748 |  |  |  |  |  |  |  |  |  |  |
Acquisition of Faiveley Transport noncontrolling interest |  |  |  |  |  |  |  |  | 760,599 |  |  |  |  |  |  |  |  |  |  |
Goodwill adjustment |  |  |  |  |  |  | $ 18,959 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 2,412,554 | 2,460,103 | 2,078,765 |  |  |  |  |  |  |  |  |  |  |
Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill adjustment |  |  |  |  |  |  | 5,252 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 716,500 | 718,958 | 550,902 |  |  |  |  |  |  |  |  |  |  |
Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill adjustment |  |  |  |  |  |  | 13,707 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 1,696,054 | 1,741,145 | 1,527,863 |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales of Faiveley |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Percentage of share capital acquired (as a percent) |  |  |  | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests in Faiveley (as a percent) | 100.00% | 22.00% | 27.00% | 49.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issued for conversion of one acquiree common share |  |  |  | 1.1538 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of additional share capital outstanding (as a percent) |  | 21.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for acquisition | $ 17,500 | $ 303,200 | $ 411,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock used for acquisition |  | $ 300 | $ 25,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital owned (as a percent) | 100.00% | 99.00% | 78.00% |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price (as a percent) | 100.00% | 98.00% | 76.00% | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  |  | $ 1,507,000 |  | $ 1,507,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit in escrow |  |  |  |  |  |  |  |  | $ 744,700 |  |  |  |  |  |  |  |  |  |  |
Acquisition of Faiveley Transport noncontrolling interest |  |  |  |  | $ 8,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for change in value of current liabilities |  |  |  |  |  |  |  | 65,300 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in receivables | $ 439,631 |  |  | 439,631 |  | 439,631 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in liabilities | 819,493 |  |  | 819,493 |  | 819,493 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to other noncurrent assets |  |  |  |  |  |  |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill adjustment |  |  |  |  |  |  |  | 74,100 |  |  |  |  |  |  |  |  |  |  |  |
Accrued compensation assumed within other liabilities |  |  |  | 25,900 |  |  | 25,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,262,350 |  |  | 1,262,350 |  | 1,262,350 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Fair Value of Receivables | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in receivables |  |  |  |  |  |  |  | 2,800 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Fair Value of Current Liabilities | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in liabilities |  |  |  |  |  |  |  | 36,200 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Fair Value of Assets Acquired and Liabilities Assumed | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in receivables |  |  |  |  |  |  |  | 64,300 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for changes in liabilities |  |  |  |  | $ 64,300 |  |  | 64,300 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for change in value of customer relationships |  |  |  |  |  |  |  | 21,800 |  |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 72,000 |  |  | 72,000 |  | 72,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Faiveley Transport | Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,190,400 |  |  | $ 1,190,400 |  | $ 1,190,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Melett |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 22,501 |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | 73,956 |  |  |  |  |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  | $ 39,259 |  |  |  |  |  |  |  |  |
TTC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,309 |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  | 32,511 |  |  |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  | 16,300 |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,300 |  |  |  |  |  |  |
ATP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,034 |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,254 |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,900 | 29,000 |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |
Workhorse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,273 |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,827 |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,200 |  |  |  |
Goodwill deductible for taxes (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.00% |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,500 |  |  |  |
Precision Turbo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,248 |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,853 |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200 |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,200 |  |
Unitrac |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,442
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,771
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,230
AM General |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 12,943 |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | 10,416 |  |  |  |  |  |  |  |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 12,097 |  |  |  |  |  |  |  |
Gerken |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,470 |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,847 |
Goodwill expected to be deductible for taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,560 |
Acquisitions other than Faiveley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit in escrow |  |  |  |  |  |  | 30,200 | 44,400 |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  | $ 103,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 1,389,600 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangible assets |  |  |  |  |  |  |  | 2,117,800 |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  | 728,200 |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions | Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  | 380,900 |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions | Intellectual Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |
Average useful life, years |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |
Recent Acquisitions | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  |  |  | $ 336,900 |  |  |  |  |  |  |  |  |  |  |  |
Average useful life, years |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |

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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=79982066&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 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=84161108&loc=d3e4845-128472 + 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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