Collaborative Arrangements and Licensing Agreements (Tables)

6 Months Ended

Jun. 30, 2021

Collaborative Arrangements and Licensing Agreements [Abstract]

Revenue from Collaborative Relationship

During the three and six months ended June 30, 2021 and 2020, we earned the following revenue from our relationship with Biogen (in millions, except percentage amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
SPINRAZA royalties (commercial revenue)	$	72.2		$	71.7		$	132.2		$	137.8
R&D revenue		27.8			26.0			45.9			47.4
Total revenue from our relationship with Biogen	$	100.0		$	97.7		$	178.1		$	185.2
Percentage of total revenue		80	%		67	%		75	%		66	%