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v3.20.2

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

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