Related Party Transactions - Narrative (Details) $ / shares in Units, $ in Millions		4 Months Ended	12 Months Ended
	Aug. 23, 2016 USD ($) barrel $ / shares $ / case $ / barrel	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 12, 2017
Related Party Transaction [Line Items]
A-B ownership of outstanding stock, percentage		31.50%		31.40%
Wynwood Brewing Company, LLC (Wynwood)
Related Party Transaction [Line Items]
Percentage of interest purchased in investment					24.50%
Affiliated entity | Contract Brewing Agreement | A - B Commercial Strategies, LLC (ABCS)
Related Party Transaction [Line Items]
Number of barrels to be brewed by affiliate | barrel	300,000
Required cost savings to share savings per agreement | $ / barrel	10.00
Number of days for prior written notice to terminate agreement	90 days
Number of days following receipt of qualifying offer	120 days
Affiliated entity | Commercial Arrangements [Member] | A - B Commercial Strategies, LLC (ABCS)
Related Party Transaction [Line Items]
Proposed sale of stock, price per share minimum on or prior to August 23, 2017 (usd per share) | $ / shares	$ 22.00
Proposed sale of stock, price per share minimum during August 23, 2017 to August 23, 2018 (usd per share) | $ / shares	23.25
Proposed sale of stock, price per share minimum on or after August 24, 2018 (usd per share) | $ / shares	$ 24.50
Affiliated entity | International Distribution Agreement | Anheuser-Busch Worldwide Investments, LLC (ABWI)
Related Party Transaction [Line Items]
Number of days for prior written notice to terminate agreement	90 days
Number of days following receipt of qualifying offer	120 days
Fees earned from related party per agreement | $		$ 3.0		$ 5.0
Term of contract and revenue recognition period	10 years
Possible one-time payment to be paid by affiliate to the Company | $	$ 20.0
Affiliated entity | International Distribution Agreement | Anheuser-Busch Worldwide Investments, LLC (ABWI) | Forecast
Related Party Transaction [Line Items]
Fees earned from related party per agreement | $			$ 6.0
Affiliated entity | International Distribution Agreement | Anheuser-Busch Worldwide Investments, LLC (ABWI) | Maximum
Related Party Transaction [Line Items]
Royalty fee per barrel (usd per barrel) | $ / barrel	40
Affiliated entity | International Distribution Agreement | Anheuser-Busch Worldwide Investments, LLC (ABWI) | Minimum
Related Party Transaction [Line Items]
Royalty fee per barrel (usd per barrel) | $ / barrel	30
Affiliated entity | Master Distributor Agreement | Anheuser Busch LLC (A-B)
Related Party Transaction [Line Items]
Number of days following receipt of qualifying offer	120 days
Margin fee per case (usd per case) | $ / case	0.25
Margin fee per case removed by amended agreement (usd per case) | $ / case	0.75
Amount per case to be reinvested (usd per case) | $ / case	0.25
Period in which affiliate can terminate agreement	3 years