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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contributions to joint venture	$ 44.7	$ 125.8
Equity Method Investments	$ 228.1
PACCAR
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Equity method investment, ownership percentage	30.00%
Maximum
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Equity method investment Contribution	$ 830.0

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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