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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
third_party
Commitments And Contingencies [Line Items]  
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones $ 788.3
Purchase commitment 246.0
Purchase commitments expected to be paid in 2023 134.4
Early Stage Development Program | Third Party  
Commitments And Contingencies [Line Items]  
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones $ 591.5
Number of third parties | third_party 2
Shareholder vs BioMarin Pharmaceutical Inc  
Commitments And Contingencies [Line Items]  
Loss contingency $ 39.0