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Share capital and earnings/(loss) per share (Details) SFr / shares in Units, SFr in Thousands, shares in Millions |  |  |  | 9 Months Ended | 12 Months Ended | 21 Months Ended |
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Nov. 10, 2020 CHF (SFr) shares | Nov. 19, 2019 CHF (SFr) shares | Apr. 09, 2019 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 shares | [1] | Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 CHF (SFr) SFr / shares shares
Earnings per share [abstract] |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  | $ 20,000,000 | $ 20,000,000 |  | $ 20,000,000 |  | $ 20,000,000 | SFr 20,000
Number of shares issued (in shares) |  |  | 488.7 |  | 499.7 |  |  |  | 499.7 | 499.7
Nominal value (in CHF per share) | SFr / shares |  |  |  |  |  |  |  |  |  | SFr 0.04
Share capital, increase (decrease) in authorized amount | SFr | SFr 320 | SFr 120 |  |  |  |  |  |  |  |
Number of additional shares authorized (in shares) | 8.0 | 3.0 |  |  |  |  |  |  |  |
Increase (decrease) in number of shares outstanding (in shares) |  |  |  | 0.1 | 0.9 |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  | 488.3 | 489.2 |  | 488.3 |  | 489.2 | 489.2
Number of shares held in treasury (in shares) |  |  |  | 3.4 | 10.5 |  | 3.4 |  | 10.5 | 10.5
Number of shares allowed to be used to fulfill future vesting (in shares) |  |  |  |  | 10.5 |  |  |  | 10.5 | 10.5
Number of shares distributed in spin-off (in shares) |  |  | 488.2 |  |  |  |  |  |  |
Dividends | $ |  |  |  |  |  |  |  |  | $ 0 |
Weighted average number of shares outstanding - Basic (in shares) |  |  |  |  | 489.0 | [1] | 488.2 | 488.2 |  |
Antidilutive securities excluded from computation (in shares) |  |  |  |  | 2.8 |  | 1.9 |  |  |
[1] | For periods prior to the Spin-off, the denominator for basic and diluted (loss) per share was calculated using 488.2 million shares of common stock distributed in the Spin-off.

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