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Summary of Significant Accounting Policies - Schedule of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member   us-gaap:AccountingStandardsUpdate201613Member
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 71.9    
Amounts accrued 32.8 $ 7.3  
Write-offs charged against the allowance (17.0)    
Ending Balance 96.6   $ 71.9
Cumulative Effect, Period Of Adoption, Adjustment      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 8.9    
Ending Balance     $ 8.9