Consolidated Statements of Shareholders' Equity (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 SFr / shares	Dec. 31, 2020 SFr / shares	Dec. 31, 2019 SFr / shares
Common shares, par value | SFr / shares				SFr 0.03	SFr 0.03
Stock Options [Member]
Issuance costs | $	$ 2.6	$ 1.2	$ 0.3
Common Shares [Member]
Issuance costs | $	$ 5.4	$ 46.4	$ 25.1
Common shares, par value | SFr / shares				SFr 0.03	SFr 0.03	SFr 0.03