Restructuring Activities - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended
	Apr. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Total cost of transformation program		$ 0.0	$ 3.5		$ 0.0	$ 9.4
Restructuring costs		0.7	48.8		4.0	65.5
Technology Realignment Program [Member]
Restructuring Cost and Reserve [Line Items]
Expected Pre-tax charges	$ 5.0	3.6
Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 0.7	$ 48.8		4.0	$ 65.5
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Expected Pre-tax charges					92.5
Minimum [Member] \| Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Expected Pre-tax charges				$ 74.0	$ 73.1

- Definition

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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