Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 1,843,498	$ 1,951,230	$ 3,638,932	$ 3,931,737
Product
Disaggregation of Revenue [Line Items]
Net sales	1,716,143	1,787,290	3,365,411	3,590,828
Fluid milk
Disaggregation of Revenue [Line Items]
Net sales	1,092,856	1,157,288	2,227,752	2,417,222
Ice cream
Disaggregation of Revenue [Line Items]
Net sales	316,398	321,005	541,598	560,603
Fresh cream
Disaggregation of Revenue [Line Items]
Net sales	104,143	99,816	200,518	191,766
Extended shelf life and other dairy products
Disaggregation of Revenue [Line Items]
Net sales	44,571	46,183	88,156	91,425
Cultured
Disaggregation of Revenue [Line Items]
Net sales	64,839	65,504	126,746	129,670
Other beverages
Disaggregation of Revenue [Line Items]
Net sales	65,580	66,700	133,990	137,044
Other
Disaggregation of Revenue [Line Items]
Net sales	27,756	30,794	46,651	63,098
Branded products
Disaggregation of Revenue [Line Items]
Net sales	856,984	871,269	1,708,480	1,763,395
Private label products
Disaggregation of Revenue [Line Items]
Net sales	859,159	916,021	1,656,931	1,827,433
Sales of excess raw materials
Disaggregation of Revenue [Line Items]
Net sales	90,122	122,880	208,515	274,682
Sales of other bulk commodities
Disaggregation of Revenue [Line Items]
Net sales	$ 37,233	$ 41,060	$ 65,006	$ 66,227