v3.20.4
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Employee benefit Plan (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2021
Net periodic benefit cost        
Net periodic benefit cost $ 1.8 $ 1.7 $ 1.1  
U.S. Pension Benefits        
Pension plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets        
Aggregated projected benefit obligation at end of period (123.9) (115.9)    
Aggregated fair value of plan assets at end of period 84.2 76.3    
Net liability for benefit cost - funded status (39.7) (39.6)    
Aggregated accumulated benefit obligation $ 123.9 $ 115.9    
Aggregated projected benefit obligation       $ 3.7
Weighted-average assumptions used to determine net periodic benefit cost        
Discount rate (as a percent) 3.07% 4.12% 3.42%  
Weighted average expected long-term return on plan assets (as a percent) 6.70% 6.70% 7.00%  
Benefits expected to be paid        
2021 $ 4.7      
2022 5.4      
2023 4.8      
2024 5.2      
2025 5.3      
Years 2026 - 2030 28.9      
Net periodic benefit cost        
Net periodic benefit cost 1.8 $ 1.7 $ 1.1  
International Pension Benefits        
Pension plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets        
Aggregated projected benefit obligation at end of period (133.1) (120.5)    
Aggregated fair value of plan assets at end of period 128.7 119.4    
Net liability for benefit cost - funded status (4.4) (1.1)    
Aggregated accumulated benefit obligation $ 129.5 $ 117.2    
Weighted-average assumptions used to determine benefit obligations        
Rate of compensation increase (as a percent) 2.27% 2.19% 2.19%  
Weighted-average assumptions used to determine net periodic benefit cost        
Discount rate (as a percent) 1.97% 2.86% 2.58%  
Weighted average expected long-term return on plan assets (as a percent) 2.15% 2.99% 2.86%  
Rate of compensation increase (as a percent) 2.27% 2.19% 2.19%  
Benefits expected to be paid        
2021 $ 3.3      
2022 3.4      
2023 3.5      
2024 3.6      
2025 3.7      
Years 2026 - 2030 $ 19.9      
Pension Benefits | U.S. Pension Benefits        
Weighted-average assumptions used to determine benefit obligations        
Discount rate (as a percent) 2.26% 3.07%    
Pension Benefits | International Pension Benefits        
Weighted-average assumptions used to determine benefit obligations        
Discount rate (as a percent) 1.78% 1.97%    
Rate of compensation increase (as a percent) 2.29% 2.27%    
Weighted-average assumptions used to determine net periodic benefit cost        
Rate of compensation increase (as a percent) 2.29% 2.27%