Goodwill and other intangible assets, net Components of intangible assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,549,695 $ 1,573,043
Accumulated amortization (366,146) (356,323)
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 616,788 624,574
Accumulated amortization (196,679) (192,876)
Intellectual Property    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 489,857 467,068
Accumulated amortization (151,521) (146,131)
Distribution Rights    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 15,519 16,101
Accumulated amortization (13,751) (14,243)
Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 386,194 396,269
Accumulated amortization (3,858) (2,764)
Non-compete Agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 337 337
Accumulated amortization (337) (309)
In Process Research and Development    
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization 0 0
Indefinite-lived intangible assets $ 41,000 $ 68,694