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Postretirement and Other Benefits - Expected Future Benefit Payments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
United States | Pension Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
2019 | $ 8.6 |
2020 | 8.4 |
2021 | 8.3 |
2022 | 8.2 |
2023 | 8.0 |
2024 - 2028 | 38.3 |
Employer contributions | 0.0 | $ 0.0
United States | OPEB Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
2019 | 0.1 |
2020 | 0.1 |
2021 | 0.1 |
2022 | 0.1 |
2023 | 0.1 |
2024 - 2028 | 0.3 |
Employer contributions | 0.0 | 0.3
France | Pension Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
2019 | 2.4 |
2020 | 0.5 |
2021 | 1.2 |
2022 | 0.8 |
2023 | 1.8 |
2024 - 2028 | 7.3 |
Employer contributions | $ 1.2 | $ 1.9

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