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Business Acquisition (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 07, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 5,746.1   $ 5,706.4
Nightstar      
Business Acquisition [Line Items]      
Cash and Equivalents   $ 107.8  
Marketable Securities   7.5  
In-process research and development   700.0  
Goodwill   112.6  
Deferred Tax Liability   (77.0)  
Other, net   1.3  
Total purchase price   $ 852.2