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Contingencies and commitments (Additional Information) (Details)					2 Months Ended
	Jul. 31, 2019 lawsuit	Jun. 04, 2019 lawsuit	Apr. 10, 2019 lawsuit	Apr. 04, 2019 agreement	May 10, 2019 lawsuit	Apr. 10, 2019 plaintiffs lawsuit
Novartis Breach Of Contract Action
Loss Contingencies [Line Items]
Agreements breached | agreement				2
Sensipar Antitrust Class Actions
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | plaintiffs						4
Loss contingency, number of lawsuits	4		4			2
Humira Biosimilar Antitrust Class Actions
Loss Contingencies [Line Items]
Loss contingency, number of lawsuits		12			12
Number of complaints stayed					6

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- Definition

Gain Contingency, Number Of Agreements Breached

+ References

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- Definition

Loss Contingency, Number Of Complaints Stayed By The Court

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349

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- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

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