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Revenue Recognition (Costs to Obtain a Contract) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Deferred commission costs $ 17.9 $ 17.5
Commissions expense recognized $ 1.5  
Minimum    
Disaggregation of Revenue [Line Items]    
Amortization period 3 years  
Maximum    
Disaggregation of Revenue [Line Items]    
Amortization period 7 years