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Pension and Other Postretirement Benefits - Expected Benefit Payments (Details 3)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments in 2020 $ 142.6
Expected Future Benefit Payments in 2021 134.7
Expected Future Benefit Payments in 2022 137.2
Expected Future Benefit Payments in 2023 125.4
Expected Future Benefit Payments in 2024 130.7
Expected Future Benefit Payments in 2025 through 2029 592.7
Other Postretirement Benefit Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments in 2020 35.6
Expected Future Benefit Payments in 2021 34.7
Expected Future Benefit Payments in 2022 34.0
Expected Future Benefit Payments in 2023 32.1
Expected Future Benefit Payments in 2024 30.4
Expected Future Benefit Payments in 2025 through 2029 $ 129.4