Stock-Based Compensation Plans - Summary of Transactions of the Company's Share Based Compensation (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	$ 2.5	$ 3.7	$ 4.6	$ 8.2
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	2.2	2.2	4.1	4.2
Stock Equivalent Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	$ 0.3	$ 1.5	$ 0.5	$ 4.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details