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Accounting Policies - Additional Information (Details) - USD ($) | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | May 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum recurring transfer (up to) |  | $ 200,000,000 |  | $ 150,000,000
Accounts receivable | $ 960,300,000 |  | $ 969,300,000 |
Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable | $ 284,800,000 |  |  |

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