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Business Acquisition (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Jun. 07, 2019
Business Acquisition [Line Items]      
Goodwill $ 5,752.0 $ 5,757.8  
Nightstar      
Business Acquisition [Line Items]      
Cash and Equivalents     $ 107.8
Marketable Securities     7.5
In-process research and development     700.0
Goodwill     117.5
Deferred Tax Liability     (81.9)
Other, net     1.3
Total purchase price     $ 852.2