COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2021	Jun. 30, 2020
Commitments And Contingencies [Line Items]
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones	$ 762.5
Purchase commitment	251.7
Purchase commitments expected to be paid in 2023	205.9
Shareholder vs BioMarin Pharmaceutical Inc
Commitments And Contingencies [Line Items]
Loss contingency	$ 39.0
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		$ 381.5	$ 210.0