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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