Other Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2025

Intangible Assets [Abstract]

Summary of Detailed Information About Intangible Assets



(in millions €)			Goodwill
Acquisition costs
As of January 1, 2024			362.5
Currency differences			18.1
As of December 31, 2024			380.6
Additions from business combinations			10.6
Currency differences			(22.8)
As of December 31, 2025			368.4



(in millions €)			Goodwill
Cumulative impairment charges
As of January 1, 2024			—
Impairment			—
As of December 31, 2024			—
Impairment			0.5
As of December 31, 2025			0.5



(in millions €)			Goodwill
Carrying amount
As of December 31, 2024			380.6
As of December 31, 2025			367.9



(in millions €)			In-process R&D		Intellectual property rights, licenses, software and similar rights		Work in progress and advance payments		Total
Acquisition costs
As of January 1, 2024			443.5		455.1		22.4		921.0
Additions			97.1		6.2		11.9		115.2
Disposals			—		(2.9)		—		(2.9)
Reclassifications			—		11.6		(11.6)		—
Currency differences			—		11.1		—		11.1
As of December 31, 2024			540.6		481.1		22.7		1,044.4
Additions			565.1		6.6		2.1		573.8
Disposals			—		(0.1)		—		(0.1)
Reclassifications			(644.8)		648.8		(4.0)		—
Currency differences			(14.8)		(6.8)		(0.2)		(21.8)
Additions from business combinations			167.7		245.4		—		413.1
As of December 31, 2025			613.8		1,375.0		20.6		2,009.4



(in millions €)			In-process R&D		Intellectual property rights, licenses, software and similar rights		Work in progress and advance payments		Total
Cumulative amortization and impairment charges
As of January 1, 2024			—		116.9		—		116.9
Amortization			—		54.8		—		54.8
Impairment			55.1		28.2		—		83.3
Disposals			—		(2.8)		—		(2.8)
Currency differences			—		1.8		—		1.8
As of December 31, 2024			55.1		198.9		—		254.0
Amortization			—		67.1		—		67.1
Impairment			85.4		3.1		—		88.5
Disposals			—		—		—		—
Currency differences			—		(6.2)		—		(6.2)
As of December 31, 2025			140.5		262.9		—		403.4



(in millions €)			In-process R&D		Intellectual property rights, licenses, software and similar rights		Work in progress and advance payments		Total
Carrying amount
As of December 31, 2024			485.5		282.2		22.7		790.4
As of December 31, 2025			473.3		1,112.1		20.6		1,606.0

Summary of Goodwill Recognized



			CGU Immunotherapies						CGU External Product Sales of JPT						CGU External Business of InstaDeep						Total

(in millions €)			As of December 31, 2025			As of December 31, 2024			As of December 31, 2025			As of December 31, 2024			As of December 31, 2025			As of December 31, 2024			As of December 31, 2025			As of December 31, 2024
Goodwill			358.3			369.8			—			0.5			9.6			10.3			367.9			380.6
Intangible assets with indefinite useful life			474.3			486.5			—			—			—			—			474.3			486.5
Total			832.6			856.3			—			0.5			9.6			10.3			842.2			867.1