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Pension Benefits - Pension Benefit Payments (Details) - Pension Plans, Defined Benefit
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Estimated Pension Benefit Payments, 2020 $ 31.4
Estimated Pension Benefit Payments, 2021 32.1
Estimated Pension Benefit Payments, 2022 33.2
Estimated Pension Benefit Payments, 2023 34.0
Estimated Pension Benefit Payments, 2024 34.7
Estimated Pension Benefit Payments, 2025 - 2029 $ 179.1