Goodwill and other intangible assets, net - Components of intangible assets (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 2,956,876	$ 2,964,632
Accumulated Amortization	(650,672)	(580,884)
In-process research and development
Finite-Lived Intangible Assets [Line Items]
In-process research and development	29,763	34,672
Accumulated Amortization	0	0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	1,016,254	1,023,837
Accumulated Amortization	(302,216)	(281,263)
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	1,295,555	1,287,487
Accumulated Amortization	(296,217)	(258,580)
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	23,570	23,697
Accumulated Amortization	(17,417)	(16,996)
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	568,227	571,510
Accumulated Amortization	(29,244)	(22,069)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	23,507	23,429
Accumulated Amortization	$ (5,578)	$ (1,976)