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Consolidated Statements of Shareholders' Equity (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 SFr / shares	Dec. 31, 2019 SFr / shares	Dec. 31, 2018 SFr / shares
Common shares, par value | SFr / shares				SFr 0.03	SFr 0.03
Stock Options [Member]
Issuance costs | $	$ 1.2	$ 0.3	$ 0.4
Common Shares [Member]
Issuance costs | $	$ 46.4	$ 25.1	$ 23.8
Common shares, par value | SFr / shares				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))
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- 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
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