Contingencies and commitments (Details) $ in Millions				8 Months Ended	9 Months Ended
	Oct. 03, 2018 patent	Sep. 11, 2018 USD ($)	Aug. 31, 2018 patent	Aug. 30, 2018 patent	Sep. 30, 2018 patent
MVASI Patent Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed			8	26
Adello NEUPOGEN Patent Litigation [Member]
Gain Contingencies [Line Items]
Gain contingency, number of patents allegedly infringed upon					17
Adello NEUPOGEN Patent Litigation [Member] | Subsequent Event [Member]
Gain Contingencies [Line Items]
Gain contingency, number of patents allegedly infringed upon	4
Hospira EPOGEN Patent Litigation [Member]
Gain Contingencies [Line Items]
Amount awarded in damages for infringement of patent | $		$ 70