Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 1,840,021	$ 1,849,710	$ 1,843,498	$ 1,795,434	$ 1,929,480	$ 1,894,066	$ 1,951,230	$ 1,980,507	$ 7,328,663	$ 7,755,283	$ 7,795,025
Product
Disaggregation of Revenue [Line Items]
Revenues									6,820,887	7,082,397	7,696,584
Fluid milk
Disaggregation of Revenue [Line Items]
Revenues									4,580,538	4,756,360	5,315,731
Ice cream
Disaggregation of Revenue [Line Items]
Revenues									1,040,979	1,077,027	1,107,665
Fresh cream
Disaggregation of Revenue [Line Items]
Revenues									424,359	397,206	388,514
Extended shelf life and other dairy products
Disaggregation of Revenue [Line Items]
Revenues									171,003	189,860	196,374
Cultured
Disaggregation of Revenue [Line Items]
Revenues									250,961	260,044	282,432
Other beverages
Disaggregation of Revenue [Line Items]
Revenues									256,935	278,838	290,970
Other
Disaggregation of Revenue [Line Items]
Revenues									96,112	123,062	114,898
Branded products
Disaggregation of Revenue [Line Items]
Revenues									3,421,371	3,531,656	3,808,496
Private label products
Disaggregation of Revenue [Line Items]
Revenues									3,399,516	3,550,741	3,888,088
Sales of excess raw materials
Disaggregation of Revenue [Line Items]
Revenues									380,295	515,162	0
Sales of other bulk commodities
Disaggregation of Revenue [Line Items]
Revenues									127,481	157,724	98,441
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Revenues									380,295	515,162
Reduction of cost of sales									$ (380,300)	$ 515,200	606,900
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Sales of excess raw materials
Disaggregation of Revenue [Line Items]
Reduction of cost of sales											$ 606,900