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Subsequent Events (Details) - Subsequent Event - Scenario, Forecast - Aratana
$ / shares in Units, $ in Millions
8 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
right
$ / shares
shares
Subsequent Event [Line Items]    
Common stock right to receive converted shares (in shares) | shares   0.1481
Number of contingent value rights | right   1
Right to receive contingent payment (usd per share) | $ / shares   $ 0.25
Stock portion of merger consideration $ 234  
Maximum aggregate contingent payment $ 12 $ 12