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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) third_party
Commitments And Contingencies [Line Items]
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones	$ 738.6
Contingent payments reasonably possible upon achievement of certain development and regulatory activities commercial sales and licensing milestones, to be paid, year one	16.4
Purchase commitment	386.7
Purchase commitments expected to be paid in 2024	340.6
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	$ 576.5
Number of third parties | third_party	2

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