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Pension and Postretirement Benefits - Schedule of Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 9.3 | $ 14.0 | $ 16.4 | $ 24.0
Interest cost | 14.6 | 11.9 | 25.7 | 20.6
Expected return on assets | (20.3) | (22.5) | (35.7) | (38.7)
Prior service cost (credit) | 1.7 | 1.4 | 2.9 | 2.5
Actuarial loss (gain) | 0.2 | 1.2 | 0.3 | 2.0
Net periodic benefit cost (credit) | 5.5 | 6.0 | 9.6 | 10.4
Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0
Interest cost | 0.2 | 0.1 | 0.2 | 0.2
Expected return on assets | 0.0 | 0.0 | 0.0 | 0.0
Prior service cost (credit) | (0.1) | (0.2) | (0.1) | (0.4)
Actuarial loss (gain) | (0.2) | (0.1) | (0.3) | (0.1)
Net periodic benefit cost (credit) | $ (0.1) | $ (0.2) | $ (0.2) | $ (0.3)

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