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Basis of Presentation - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 34.0  
Additions charged to expense 4.9 $ 7.5
Accounts written-off (6.5)  
Balance at end of period $ 32.4