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Employee Benefits - Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 7.0
2022 6.8
2023 6.5
2024 6.3
2025 6.0
2026-2030 26.4
Salaried VEBA  
Defined Benefit Plan Disclosure [Line Items]  
2021 6.6
2022 6.4
2023 6.1
2024 5.9
2025 5.6
2026-2030 24.2
Canadian pension plan | Canadian pension plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 0.4
2022 0.4
2023 0.4
2024 0.4
2025 0.4
2026-2030 $ 2.2