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Employee Defined Benefit Retirement Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Jul. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Retirement plan liability           $ 7.9
Net periodic benefit cost $ 0.1 $ 0.1 $ 0.2 $ 0.2    
Other Long-term Investments            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined benefit obligation $ 4.3   $ 4.3   $ 4.5