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Employee plans - Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plans | U.S. Plans  
Expected Payments  
Expected future benefit payments, 2019 $ 362.2
Expected future benefit payments, 2020 359.4
Expected future benefit payments, 2021 357.1
Expected future benefit payments, 2022 354.4
Expected future benefit payments, 2023 350.9
Expected future benefit payments, 2024 - 2028 1,652.1
Pension Plans | International Plans  
Expected Payments  
Expected future benefit payments, 2019 97.8
Expected future benefit payments, 2020 101.2
Expected future benefit payments, 2021 104.2
Expected future benefit payments, 2022 112.2
Expected future benefit payments, 2023 118.2
Expected future benefit payments, 2024 - 2028 627.4
Other Postretirement Benefit Plans  
Expected Payments  
Expected future benefit payments, 2019 9.1
Expected future benefit payments, 2020 9.6
Expected future benefit payments, 2021 9.1
Expected future benefit payments, 2022 8.5
Expected future benefit payments, 2023 7.9
Expected future benefit payments, 2024 - 2028 $ 30.9