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Employee Benefit Plans - Defined Contribution Plan (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Employee Benefit Plans        
Defined contribution expense $ 4.3 $ 3.3 $ 8.4 $ 6.6