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INVESTMENTS (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Cost and Equity Method Investments    
Total equity method investments $ 320.8 $ 321.3
Total other equity investments 62.5 62.4
Total investments 383.3 383.7
Investment in 7Ridge Investments 3 LP    
Schedule of Cost and Equity Method Investments    
Total equity method investments 320.8 321.3
Investment in Japannext Co., Ltd.    
Schedule of Cost and Equity Method Investments    
Total other equity investments 36.5 36.5
Investment in Eris Innovations Holdings, LLC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 9.5 9.5
Investment in CSD Br    
Schedule of Cost and Equity Method Investments    
Total other equity investments 5.9 5.9
Investment in Coin Metrics Inc.    
Schedule of Cost and Equity Method Investments    
Total other equity investments 4.4 4.4
Investment in Vest Group Inc.    
Schedule of Cost and Equity Method Investments    
Total other equity investments 2.9 2.9
Investment in OCC    
Schedule of Cost and Equity Method Investments    
Total other equity investments 0.3 0.3
Other equity investments    
Schedule of Cost and Equity Method Investments    
Total other equity investments $ 3.0 $ 2.9