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Summary of Significant Accounting Policies (Revenue Recognition, Contract Balances) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]    
Allowance for doubtful accounts and authorized credits $ 12.4 $ 7.0
Amount of revenue recognized that included in receipts in advance and deferred revenue $ 46.4