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Employee Benefit Plans (Net Periodic Benefit Costs) (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] |  |  |  |
Interest costs | $ 2.6 | $ 1.5 | $ 5.1 | $ 3.0
Amortization of net actuarial loss | 0.6 | 1.4 | 1.1 | 2.9
Amortization of prior service cost | 0.0 | 0.1 | 0.0 | 0.2
Net periodic costs | $ 3.2 | $ 3.0 | $ 6.2 | $ 6.1

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