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Acquisitions - Adapt Total Purchase Price (Details) - USD ($)
$ in Millions
 6 Months Ended 9 Months Ended
Oct. 15, 2018
Jun. 30, 2019
Jun. 30, 2019
Business Acquisition [Line Items]      
Total purchase price   $ 0.0  
Adapt Pharma      
Business Acquisition [Line Items]      
Cash paid for acquisition $ 581.5    
Equity 37.7    
Total purchase price 668.7    
Total purchase price   $ 1.5 $ 1.5
Adapt Pharma | Previously Reported      
Business Acquisition [Line Items]      
Total purchase price $ 667.2