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Related Party Transactions - Summary of Activity Related to Agreements with Related Party (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Related Party Transaction [Line Items]
Processing fee incurred	$ 94.1	$ 87.5	$ 179.7	$ 165.6
Earnings from equity investments	4.0	3.7	7.4	6.4
Distributions received from equity investments			9.6	7.4
LM4
Related Party Transaction [Line Items]
Processing fee incurred	$ 9.2	$ 8.6	$ 17.5	$ 15.4
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Earnings from equity investments	$ 4.0	$ 3.7	$ 7.4	$ 6.4
Distributions received from equity investments	$ 4.7	$ 3.9	$ 9.6	$ 7.4

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