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Share capital and earnings/(loss) per share (Details)
SFr / shares in Units, SFr in Thousands
 9 Months Ended 12 Months Ended
Nov. 19, 2019
CHF (SFr)
SFr / shares
shares
Apr. 09, 2019
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
shares
Dec. 31, 2019
CHF (SFr)
SFr / shares
shares
Earnings per share [abstract]              
Share capital     $ 20,000,000 $ 20,000,000 $ 0   SFr 20,000
Number of shares issued   488,700,000 491,700,000 491,700,000     491,700,000
Nominal value (in CHF per share) | SFr / shares SFr 0.04           SFr 0.04
Number of shares distributed in spin-off (in shares)   488,200,000          
Increase (decrease) in share capital authorised (in shares) | SFr SFr 120            
Number of additional shares authorized (in shares) 3,000,000.0            
Increase (decrease) in number of shares outstanding (in shares)       100,000      
Number of shares outstanding (in shares)     488,300,000 488,300,000     488,300,000
Number of shares held in treasury (in shares)     3,400,000 3,400,000     3,400,000
Number of shares allowed to be used to fulfill future vesting (in shares)     3,000,000.0 3,000,000.0     3,000,000.0
Dividends | $     $ 0        
Adjusted weighted average number of ordinary shares outstanding (in shares) [1]       488,200,000 488,200,000 488,200,000  
Antidilutive securities excluded from computation (in shares)       1,900,000      
[1]
For periods prior to the Spin-off, the denominator for basic and diluted earnings per share was calculated using 488.2 million shares of common stock distributed in the Spin-off.