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Stock-Based Compensation - Restricted Stock and Restricted Stock Units (Details) - Stock options and RSUs - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock-Based Compensation
Allocated share-based compensation expense	$ 9.5	$ 7.4	$ 18.5	$ 14.3
Research and development
Stock-Based Compensation
Allocated share-based compensation expense	3.0	2.2	5.8	4.4
Selling, general and administrative
Stock-Based Compensation
Allocated share-based compensation expense	$ 6.5	$ 5.2	$ 12.7	$ 9.9

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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