COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Contingencies From time to time the Company is involved in legal actions arising in the normal course of its business. The process of resolving matters through litigation or other means is inherently uncertain and it is possible that an unfavorable resolution of these matters could adversely affect the Company, its results of operations, financial condition or cash flows. The Company’s general practice is to expense legal fees as services are rendered in connection with legal matters, and to accrue for liabilities when losses are probable and reasonably estimable based on existing information. The Company accrues for the best estimate of a loss within a range; however, if no estimate in the range is better than any other, then the minimum amount in the range is accrued. Liabilities are evaluated and refined each reporting period as additional information is known. Any receivables for insurance recoveries for these liability claims are recorded as assets when it is probable that a recovery will be realized. The Company is involved in a purported shareholder class action lawsuit filed against the Company and certain officers and directors alleging violations under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 as amended (the Exchange Act) for making materially false or misleading statements regarding the clinical trials and Biologics License Application (BLA) for ROCTAVIAN (formerly known as valoctocogene roxaparvovec) by purportedly failing to disclose that differences between the Company’s Phase 1/2 and Phase 3 clinical studies limited the ability of the Phase 1/2 study to support ROCTAVIAN’s durability of effect and, as a result, that it was foreseeable that the FDA would not approve the BLA without additional data. On March 21, 2023, the Court entered an order staying all proceedings and vacating all deadlines because the parties agreed to settle the case through a binding term sheet. The Court preliminarily approved the settlement on June 8, 2023. On October 4, 2023, plaintiff filed a motion for final approval of settlement. A final approval hearing is scheduled for November 8, 2023. The Company maintains directors and officers liability insurance that covers exposure related to this class action lawsuit. As of September 30, 2023, based on these terms the Company has recorded an estimated loss contingency of $39.0 million to Accounts Payable and Accrued Liabilities and the same amount recorded for expected insurance recoveries in Other Current Assets on the Company’s Condensed Consolidated Balance Sheets. As such, there was a net zero impact on the Company’s Condensed Consolidated Statement of Comprehensive Income in the three and nine months ended September 30, 2023. Contingent Payments As of September 30, 2023, the Company was subject to contingent payments considered reasonably possible of $788.3 million, of which $591.5 million related to early-stage development programs licensed from two third parties. Other Commitments The Company uses experts and laboratories at universities and other institutions to perform certain R&D activities. These amounts are recorded as R&D expense as services are provided. In the normal course of business, the Company enters into various firm purchase commitments primarily to procure active pharmaceutical ingredients, certain inventory-related items and certain third-party R&D services, production services and facility construction services. As of September 30, 2023, such commitments were estimated at $246.0 million, of which $134.4 million is expected to be paid in 2023 as underlying goods and services are received. The Company has also licensed technology from third parties, for which it is required to pay royalties upon future sales, subject to certain annual minimums.