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INVESTMENTS IN VARIABLE INTEREST ENTITIES (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended 19 Months Ended
Oct. 31, 2024
Jun. 30, 2022
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2019
Sep. 30, 2024
Dec. 31, 2023
Mar. 31, 2023
Apr. 30, 2021
Variable Interest Entity [Line Items]                  
Assets     $ 12,971.2     $ 12,971.2 $ 9,363.2    
Liabilities     3,359.8     3,359.8 2,643.8    
Payment for acquisition options     16.2 $ 15.0          
Variable Interest Entity, Primary Beneficiary                  
Variable Interest Entity [Line Items]                  
Assets     258.1     258.1 272.1    
Liabilities     26.7     26.7 31.5    
Variable Interest Entity, Not Primary Beneficiary | Subsequent Event                  
Variable Interest Entity [Line Items]                  
Remaining financing receivable $ 5.0                
Variable Interest Entity, Not Primary Beneficiary | Medical Device Company, April 2021 Investment                  
Variable Interest Entity [Line Items]                  
Maximum secured promissory note                 $ 45.0
Investee drew additional amount     30.0     30.0 30.0    
Carrying value of non-marketable equity securities     42.8     42.8 39.3    
Investment option to acquire     20.9     20.9 13.1    
Maximum additional required investment     3.0     3.0      
Maximum additional option to acquire investment     6.6     6.6      
Variable Interest Entity, Not Primary Beneficiary | Medical Device Company, March 2023 Investment                  
Variable Interest Entity [Line Items]                  
Payment for acquisition options           30.0      
Carrying value of non-marketable equity securities     3.5     3.5 $ 3.3    
Option to acquire investment amount               $ 45.0  
Variable Interest Entity, Not Primary Beneficiary | Medical Device Company, March 2023 Investment | Convertible Promissory Note                  
Variable Interest Entity [Line Items]                  
Investee drew additional amount               $ 5.0  
Variable Interest Entity, Not Primary Beneficiary | Medical Device Company                  
Variable Interest Entity [Line Items]                  
Loans receivables, maximum lending amount   $ 47.5              
Financing receivable     $ 42.5     $ 42.5      
Payment for acquisition options         $ 35.0