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Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) $ in Millions	3 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 SFr / shares	Jun. 30, 2020 SFr / shares	Mar. 31, 2020 SFr / shares	Sep. 30, 2019 SFr / shares	Jun. 30, 2019 SFr / shares	Mar. 31, 2019 SFr / shares
Common shares, par value						SFr 0.03
Common Shares [Member]
Issuance costs | $	$ 32.8	$ 3.1	$ 2.3	$ 1.3	$ 1.2
Common shares, par value						SFr 0.03	SFr 0.03	SFr 0.03	SFr 0.03	SFr 0.03	SFr 0.03

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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