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Employee Benefits, Net benefits expected to be paid in each of the next five fiscal years (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 8.2
2021 7.9
2022 7.7
2023 7.4
2024 7.1
2025-2029 31.1
VEBAs  
Defined Benefit Plan Disclosure [Line Items]  
2020 7.9
2021 7.6
2022 7.4
2023 7.1
2024 6.8
2025-2029 29.1
Canadian pension plan | Canadian pension plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 0.3
2021 0.3
2022 0.3
2023 0.3
2024 0.3
2025-2029 $ 2.0