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Pension Benefits - Pension Benefit Payments (Details) - Pension Plans, Defined Benefit
$ in Millions
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Estimated Pension Benefit Payments, 2020 $ 15.8
Estimated Pension Benefit Payments, 2021 15.7
Estimated Pension Benefit Payments, 2022 16.5
Estimated Pension Benefit Payments, 2023 17.2
Estimated Pension Benefit Payments, 2024 17.7
Estimated Pension Benefit Payments, 2025 - 2029 $ 93.6