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SEGMENT INFORMATION - Narrative (Details) $ in Millions | 7 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 | Dec. 31, 2018 segment | Dec. 31, 2018 reporting_units | Dec. 31, 2017 USD ($) | May 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of reportable segments |  |  |  | 3 | 3 |  |
Sales Revenue, Net | Geographic Concentration Risk | United States |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Percentage of total consolidated revenues from external customers | 67.00% |  | 67.00% |  |  | 66.00% | 61.00%
Sales Revenue, Net | Geographic Concentration Risk | United Kingdom |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Percentage of total consolidated revenues from external customers | 10.00% |  | 9.00% |  |  | 11.00% | 10.00%
Sales Revenue, Net | Geographic Concentration Risk | Canada |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Percentage of total consolidated revenues from external customers |  |  |  |  |  |  | 10.00%
Heartland |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Acquisition and integration expenses | $ 91.6 | $ 56.1 |  |  |  | $ 94.6 | $ 51.3

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