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Business Combinations - Total consideration (Details) - USD ($) $ in Thousands			12 Months Ended
	Jul. 08, 2019	Jan. 17, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Preliminary estimated fair value of the consideration
Goodwill			$ 231,045	$ 125,029	$ 5,064
Cash paid, net of cash acquired			185,090	$ 93,052
VIP
Preliminary estimated fair value of the consideration
Current assets		$ 15,617
Property, plant, and equipment		8,885
Other assets, net		295
Goodwill		112,643
Total assets		224,240
Current liabilities		22,908
Capital lease obligations		3,032
Total liabilities		25,940
Estimated purchase price		198,300
Cash paid, net of cash acquired		92,082
LLC Interests and shares of Class B common stock		90,031
Guarantee note		10,000
Contingent notes		6,900
Post-closing working capital adjustment		(713)
Estimated fair value of total consideration transferred		198,300
HBH
Preliminary estimated fair value of the consideration
Working Capital, net			1,676
Property, plant, and equipment			2,686
Goodwill			7,607
Total assets			15,769
Capital lease obligations			1,114
Total liabilities			1,114
Estimated purchase price			14,655
Cash paid, net of cash acquired			1,683
LLC Interests and shares of Class B common stock			12,972
Estimated fair value of total consideration transferred			$ 14,655
Perrigo Animal Health Acquisition
Preliminary estimated fair value of the consideration
Inventories	$ 17,998
Property, plant, and equipment	19,568
Other current assets	13,048
Other assets	9,680
Indefinite-lived intangible assets	23,040
Definite-lived intangible assets	14,480
Goodwill	105,838
Total assets	203,652
Total liabilities	19,259
Estimated purchase price	184,393
Cash paid, net of cash acquired	(185,090)
Post-closing working capital adjustment	697
Estimated fair value of total consideration transferred	$ 184,393
Finite-Lived Intangible Asset, Useful Life			13 years
Customer relationships
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			20 years
Customer relationships \| VIP
Preliminary estimated fair value of the consideration
Definite-lived intangible assets		77,200
Customer relationships \| HBH
Preliminary estimated fair value of the consideration
Definite-lived intangible assets			$ 3,800
Finite-Lived Intangible Asset, Useful Life			15 years
Brand names
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			10 years
Brand names \| VIP
Preliminary estimated fair value of the consideration
Definite-lived intangible assets		$ 9,600
Maximum
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			20 years
Maximum \| Customer relationships
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			20 years
Maximum \| Brand names
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			15 years
Minimum
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			2 years
Minimum \| Customer relationships
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			12 years
Minimum \| Brand names
Preliminary estimated fair value of the consideration
Finite-Lived Intangible Asset, Useful Life			5 years