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Employee Benefit Plans - Defined Contribution Plan (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Employee Benefit Plans        
Defined contribution expense $ 4.4 $ 3.5 $ 12.8 $ 10.1