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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SWITZERLAND      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of minimum investment return 1.00% 1.00% 1.00%
Unfunded net pension $ 75.7 $ 42.9  
Employee benefit plan obligations 170.0 127.1  
Pension cost (reversal) 15.5 14.7 $ 14.8
SWITZERLAND | Other (income) expense, net      
Defined Contribution Plan Disclosure [Line Items]      
Pension cost (reversal) 2.6 1.2 1.3
GERMANY      
Defined Contribution Plan Disclosure [Line Items]      
Employee benefit plan obligations 75.5 59.6  
Periodic pension cost 6.2 5.1 5.3
GERMANY | Other (income) expense, net      
Defined Contribution Plan Disclosure [Line Items]      
Periodic pension cost $ 2.0 1.4 1.5
Domestic Plan      
Defined Contribution Plan Disclosure [Line Items]      
Minimum qualifying age for employee benefit plan 21 years    
Expenses related to savings plan $ 44.3 44.8 $ 42.2
Deferred Compensation Plan      
Defined Contribution Plan Disclosure [Line Items]      
Deferred compensation liability $ 120.0 $ 114.6