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Accounting Policies - Additional Information (Detail) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) reportingUnit | May 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Noncurrent contract assets | $ 103,800,000 |  | $ 109,400,000
Noncurrent contract liabilities | 67,500,000 |  | 77,000,000.0
Provisions for loss contracts | 101,300,000 |  | 118,500,000
Maximum recurring transfer |  | $ 150,000,000.0 |
Accounts receivable | $ 1,020,000,000.0 |  | $ 1,149,900,000
Number of reporting units | reportingUnit | 3 |  |
Collateral Pledged |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | $ 191,700,000 |  |

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