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Nature of Operations - Additional Information (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
May 04, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
shares
Dec. 31, 2019
$ / shares
shares
Jun. 30, 2020
$ / shares
Class of Stock [Line Items]        
Common stock, par value (in usd per share)     $ 0.01  
Shares repurchased (percent) 15.00%      
Private Placement        
Class of Stock [Line Items]        
Sale of stock price per share (in dollars per share) $ 18.25      
Gross proceeds from stock issuance | $ $ 855      
Holdings        
Class of Stock [Line Items]        
Ownership percentage by noncontrolling owners (percent) 57.00%   51.00% 51.00%
Holdings | Private Placement And PPU Holders Distribution        
Class of Stock [Line Items]        
Decrease in noncontrolling ownership interest (percent) 18.00%      
Impax Acquisition | Holdings        
Class of Stock [Line Items]        
Ownership by parent (percent) 25.00%      
Ownership percentage by noncontrolling owners (percent) 75.00%      
Amneal Holdings, LLC | Impax Acquisition        
Class of Stock [Line Items]        
Shareholder ownership (percent) 75.00%      
Impax Common Stock Holders | Impax Acquisition        
Class of Stock [Line Items]        
Shareholder ownership (percent) 25.00%      
PIPE Investors        
Class of Stock [Line Items]        
Shareholder ownership (percent) 15.00%      
Class A Common Stock        
Class of Stock [Line Items]        
Common stock, par value (in usd per share) $ 0.01   $ 0.01 $ 0.01
Stock conversion ratio 1      
Conversion of Class B-1 Common Stock (in shares) | shares     12.3  
Class A Common Stock | Private Placement        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares) | shares 34.5      
Class A Common Stock | PPU Holders Distribution        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares) | shares 6.9      
Class B Common Stock        
Class of Stock [Line Items]        
Common stock, par value (in usd per share) $ 0.01   $ 0.01 $ 0.01
Class B-1 Common Stock        
Class of Stock [Line Items]        
Common stock, par value (in usd per share) $ 0.01      
Conversion of Class B-1 Common Stock (in shares) | shares   12.3    
Class B-1 Common Stock | Private Placement        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares) | shares 12.3      
Impax Laboratories, LLC        
Class of Stock [Line Items]        
Common stock, par value (in usd per share) $ 0.01