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v3.25.3

Components of Net Pension (Income) Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 24.0 | $ 25.3 | $ 71.4 | $ 80.7
Interest on projected benefit obligation | 36.4 | 34.4 | 108.3 | 101.4
Expected return on assets | (63.2) | (60.8) | (188.6) | (181.9)
Amortization of prior service costs | 0.3 | 0.3 | 1.0 | 1.0
Recognized actuarial loss | 0.6 | 2.5 | 1.4 | 5.3
Net pension (income) expense | $ (1.9) | $ 1.7 | $ (6.5) | $ 6.5

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