Employee Retirement Benefit Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]
Maximum employee eligible contributions, percent	100.00%
US Based Employees
Defined Contribution Plan Disclosure [Line Items]
Total contributions under plans	$ 12.1	$ 11.3	$ 12.8
Non US Based Employees
Defined Contribution Plan Disclosure [Line Items]
Total contributions under plans	$ 4.8	$ 4.1	$ 4.5