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Revenue (Summary of Contract Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Accounts receivable, less allowance for credit losses $ 239.3 $ 205.1
Deferred commissions, current and non-current 52.0 39.6
Total contract assets $ 291.3 $ 244.7