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Retirement Plans - Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 47.2
2022 48.0
2023 49.3
2024 51.0
2025 51.9
2026-2030 271.7
OPEB  
Defined Benefit Plan Disclosure [Line Items]  
2021 24.1
2022 24.0
2023 23.8
2024 23.3
2025 22.8
2026-2030 105.1
Estimated Subsidy Reimbursements  
Defined Benefit Plan Disclosure [Line Items]  
2021 1.5
2022 1.5
2023 1.5
2024 1.5
2025 1.5
2026-2030 $ 6.8