Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash for Balance Sheets and Cash Flows (Detail)

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Basis of Presentation - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash for Balance Sheets and Cash Flows (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash, Cash Equivalents and Restricted Cash [Line Items]        
Cash and cash equivalents $ 575.2 $ 508.0    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 595.5 516.3 $ 610.4 $ 1,054.0
Prepaid expenses and other current assets [Member]        
Cash, Cash Equivalents and Restricted Cash [Line Items]        
Restricted cash 15.3 2.5    
Other Assets [Member]        
Cash, Cash Equivalents and Restricted Cash [Line Items]        
Restricted cash $ 5.0 $ 5.8