Collaborative Arrangements and Licensing Agreements (Tables)

3 Months Ended

Mar. 31, 2021

Biogen [Member]

Collaborative Arrangements and Licensing Agreements [Abstract]

Revenue from Collaborative Relationship

During the three months ended March 31, 2021 and 2020, we earned the following revenue from our relationship with Biogen (in millions, except percentage amounts):

	Three Months Ended March 31,
	2021			2020
SPINRAZA royalties (commercial revenue)	$	60.0		$	66.0
R&D revenue		18.1			21.4
Total revenue from our relationship with Biogen	$	78.1		$	87.4
Percentage of total revenue		70	%		66	%