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v3.23.2

Components of Net Pension (Income) Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 21.9 | $ 43.3 | $ 46.9 | $ 75.8
Interest on projected benefit obligation | 32.6 | 23.8 | 63.7 | 42.9
Expected return on assets | (57.6) | (60.1) | (115.1) | (108.8)
Amortization of prior service costs | 0.4 | 0.2 | 0.7 | 0.3
Recognized actuarial loss | 1.7 | 9.0 | 2.4 | 14.6
Net pension (income) expense | $ (1.0) | $ 16.2 | $ (1.4) | $ 24.8

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