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Summary of significant accounting policies (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) item	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) item	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Accounts Receivable
Allowance for doubtful accounts	$ 0.0		$ 0.0		$ 0.0
Inventory
Shelf life for finished goods inventory, maximum			36 months
Variable Interest Entities
Number of entities in which variable interest held | item	0		0
Percentage of MediCare Part D Insurance Coverage Gap Required to be Funded by Manufacturers			70.00%
Medicare Part D Insurance Coverage Gap, Increase in Eligible Patient Spending, Percentage				30.00%
Advertising Expenses
Advertising expenses	$ 13.7	$ 6.4	$ 32.0	$ 16.5
MorphoSys AG
Variable Interest Entities
Collaboration Agreement Profit Loss Sharing Ratio			50.00%	50.00%
ICLUSIG
Variable Interest Entities
Amortization period			12 years 6 months

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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