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Revenue Recognition Contract Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue Recognition [Abstract]    
Capitalized contract cost, amortization term 5 years  
Capitalized contract cost $ 9.0 $ 9.1
Capitalized Contract Cost, Amortization $ 3.5 $ 3.8