XML 153 R134.htm IDEA: XBRL DOCUMENT v3.20.4
Equity-based Compensation Plan (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity-Based Compensation Plan [Abstract]      
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition 1 1 year 6 months    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized $ 3.9    
Number of options - Options granted 0 0 0