Legal Proceedings (Details) $ in Millions					1 Months Ended	12 Months Ended
	Apr. 07, 2017 USD ($)	Aug. 24, 2015 lawsuit	Mar. 04, 2015 officer	Sep. 12, 2012 USD ($) employee	Dec. 31, 2017 USD ($)	Dec. 31, 2017 lawsuit
Loss Contingencies [Line Items]
Number of shareholder derivative lawsuits | lawsuit						4
Ann Pope and Anthony Pope v. Horatio V. Cabasares, M.D., P.C. Houston Healthcare Systems, Inc., Akorn Sales, Inc., and Akorn, Inc.
Loss Contingencies [Line Items]
Damages sought	$ 20.5
Yeung v. Akorn, Inc., et al.
Loss Contingencies [Line Items]
Number of officers | officer			3
Yeung v. Akorn, Inc., et al. and Sarzynski v. Akorn, Inc., et al.
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit		2
Litigation settlement, amount awarded to other party					$ 24.0
Payments for legal settlements					5.0
Safriet v. Rai, et al., No. 15-cv-7275, and Glaubach v. Rai, et al., No. 15- 1112
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit						2
Fera Pharmaceuticals, LLC v. Akorn Inc.
Loss Contingencies [Line Items]
Damages sought				$ 135.0
Number of former employees as defendants | employee				1
Company's Insurers | Yeung v. Akorn, Inc., et al. and Sarzynski v. Akorn, Inc., et al.
Loss Contingencies [Line Items]
Payments for legal settlements					$ 19.0