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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Estimated future amortization (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets |  |  |  |  |  |  |
Impairment charge | $ 1.8 |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  | $ 36.6 | $ 81.0 |
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Impairment of assets |  |
Amortization expense |  |  |  |  | $ 70.2 | 88.7 | $ 116.6
Amortization expense |  |  |  |  |  |  |
Expected amortization, year one |  |  |  |  | 62.7 |  |
Expected amortization, year two |  |  |  |  | 55.9 |  |
Expected amortization, year three |  |  |  |  | 50.3 |  |
Expected amortization, year four |  |  |  |  | 45.7 |  |
Expected amortization, year five |  |  |  |  | 40.5 |  |
Customer relationships |  |  |  |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets |  |  |  |  |  |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Impairment of assets |  | Impairment of assets |  |  |
Impairment of intangible assets |  | $ 17.1 |  | $ 17.1 |  |  |
Digital |  |  |  |  |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets |  |  |  |  |  |  |
Impairment of intangible assets |  |  | $ 81.0 |  | 0.0 | 81.0 |
Amortization expense |  |  |  |  | $ 0.0 | $ 2.3 |

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