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Subsequent events (Details) - Subsequent Event
Oct. 04, 2018
USD ($)
Oct. 04, 2018
EUR (€)
instrument
Oct. 03, 2018
USD ($)
Essential Medical, Inc.      
Subsequent Event [Line Items]      
Cash payment to acquire business $ 60,000,000    
Additional payments to acquire businesses $ 100,000,000    
Cross Currency Interest Rate Contract | Designated as Hedging Instrument      
Subsequent Event [Line Items]      
Derivative, number of instruments held | instrument   6  
Derivative, notional amount   € 433,900,000.0 $ 500,000,000
Derivative, fixed interest rate   1.942% 4.625%