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Shareholders' Equity - Narrative (Details)
1 Months Ended 9 Months Ended
Mar. 31, 2017
USD ($)
shares
Dec. 31, 2019
USD ($)
SFr / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
SFr / shares
Dec. 31, 2018
USD ($)
$ / shares
Stockholders' Equity Note [Abstract]          
Authorized amount in buyback program $ 250,000,000.0        
Shares authorized to be repurchased (in shares) | shares 17,300,000        
Period to complete share repurchase program 3 years        
Amount still available for repurchase   $ 172,400,000 $ 172,400,000    
Cash dividends per share (in dollars/CHF per share) | (per share)   $ 0.73 $ 0.74 SFr 0.67 $ 0.69
Payment of cash dividends     $ 124,180,000   $ 113,971,000