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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Income tax expense (benefit) | $ (16.6) | $ (6.0) |
Deferred income tax expense (benefit) | 12.0 | $ 3.2 |
Deferred tax asset related to capital losses | 9.8 |  |
Deferred tax assets related to interest expense limitation | $ 0.9 |  |
Fees and other income |  |  | $ 2.5
Percentage of applicable cash saving in income tax distributable to specified unitholders | 85.00% |  |
Percentage of applicable cash saving in income tax available for the entity | 15.00% |  |
Other assets |  |  |
Income Tax Contingency [Line Items] |  |  |
Deferred tax liabilities | $ (14.2) |  | (2.1)
Accrued Liabilities |  |  |
Income Tax Contingency [Line Items] |  |  |
Liability for unrecognized tax benefits for uncertain income tax positions |  |  | $ 0.2
Amount Payable Pursuant to Tax Receivable Agreement |  |  |
Income Tax Contingency [Line Items] |  |  |
Amount payable pursuant to tax receivable agreement | $ 1.6 |  |

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