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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
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.