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Revenue Recognition (Costs to Obtain Contracts) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Change in Capitalized Contract Costs [Roll Forward]  
Balance at January 1, 2020 $ 12.7
Costs to obtain contracts 0.6
Amortization of costs to obtain contracts (3.7)
Balance at September 30, 2020 $ 9.6