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Business Combinations - Narrative - Lumara Health Acquisition (Details) - Lumara Health - USD ($)
shares in Millions
3 Months Ended 9 Months Ended
Nov. 12, 2014
Sep. 30, 2016
Sep. 30, 2016
Business Acquisition [Line Items]      
Ownership percentage acquired (as a percent) 100.00%    
Cash consideration $ 600,000,000    
Fair value of AMAG common stock issued 111,964,000    
Additional merger consideration 350,000,000.0    
Escrow Fund      
Business Acquisition [Line Items]      
Escrow fund $ 35,000,000    
Annual Net Sales Milestone      
Business Acquisition [Line Items]      
Net sales   $ 300,000,000  
Milestone payment due     $ 100,000,000
Common Stock      
Business Acquisition [Line Items]      
Shares of common stock 3.2    
Fair value of AMAG common stock issued $ 112,000,000