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Employee Retirement Plans (Defined Contribution Plans) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Retirement Benefits [Abstract]        
Employee stock ownership plan contribution expense $ 0.0 $ 0.0 $ 0.0 $ 0.0