Collaborative Arrangements and Acquisitions - Janssen Pharmaceuticals, Inc. (Details) - Janssen Pharmaceuticals, Inc. - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement, up-front payment						$ 35.0
Time period of notice required to terminate	6 months
Reimbursement for development and commercialization of compounds		$ 0.3	$ 4.3	$ 1.8	$ 7.8