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Pension Plans and Other Postretirement Benefits Current Forecast of Benefit Payments which Reflect Expected Future Service (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 3.3
2022 3.2
2023 3.2
2024 3.2
2025 3.1
2026-2030 14.7
U.S. Plans | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 43.0
2022 43.4
2023 43.8
2024 44.1
2025 44.6
2026-2030 213.2
Foreign Plans | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 12.2
2022 11.5
2023 14.2
2024 12.5
2025 12.2
2026-2030 $ 66.4