Business Segment Information - Major customers (Details) - segment	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Major Customers
Number of reportable segments	4
Net sales. \| Customer concentration \| Anheuser-Busch InBev and affiliates
Major Customers
Percentage of consolidated net sales	12.00%	13.00%	14.00%
Net sales. \| Customer concentration \| Coca-Cola Bottlers' Sales & Services Company LLC and affiliates
Major Customers
Percentage of consolidated net sales	9.00%	12.00%	11.00%
Net sales. \| Customer concentration \| U.S. Government
Major Customers
Percentage of consolidated net sales	13.00%	10.00%	9.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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