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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Related Party Transaction [Line Items] |  |  |  |
Processing fee incurred | $ 87.5 | $ 73.1 | $ 165.6 | $ 135.6
Earnings from equity investments | 3.7 | 1.7 | 6.4 | 3.3
Distributions received from equity investments |  |  | 7.4 | 4.4
LM4 |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Processing fee incurred | $ 8.6 | $ 5.8 | $ 15.4 | $ 10.8
Operating Cost and Expense, Related Party [Extensible Enumeration] | us-gaap:RelatedPartyMember | us-gaap:RelatedPartyMember | us-gaap:RelatedPartyMember | us-gaap:RelatedPartyMember
Earnings from equity investments | $ 3.7 | $ 1.7 | $ 6.4 | $ 3.3
Distributions received from equity investments | $ 3.9 | $ 1.8 | $ 7.4 | $ 4.4

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