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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Related Party Transaction [Line Items] |  |  |  |
Earnings from equity investments | $ 2.9 | $ 0.9 | $ 5.6 | $ 3.6
Distributions received from equity investments |  |  | 11.5 | 3.8
LM4 |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Processing fee incurred | 7.1 | 5.0 | 14.0 | 11.4
Earnings from equity investments | 2.9 | 0.9 | 5.6 | 3.6
Distributions received from equity investments | $ 4.0 | $ 3.8 | $ 11.5 | $ 3.8

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