Quarterly report pursuant to Section 13 or 15(d)

Employee Defined Benefit Retirement Plans (Details)

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Employee Defined Benefit Retirement Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
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 $ 0.2    
Other Long-term Investments        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined benefit obligation $ 6.3 $ 6.3 $ 6.4