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Pension Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Estimated U.S. federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, no more than | $ 0.3 |
Domestic Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Employer contributions | 2.6 | $ 0.0
Defined benefit plan, estimated future employer contributions in next fiscal year | 10.0 |
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity |  |
Expected future benefit payments in 2018 | 13.7 |
Expected future benefit payments in 2019 | 8.5 |
Expected future benefit payments in 2020 | 8.6 |
Expected future benefit payments in 2021 | 8.0 |
Expected future benefit payments in 2022 | 8.4 |
Expected future benefit payments in 2023-2027 | 37.2 |
Foreign Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Employer contributions | 17.5 | 23.2
Defined benefit plan, estimated future employer contributions in next fiscal year | 18.0 |
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity |  |
Expected future benefit payments in 2018 | 22.3 |
Expected future benefit payments in 2019 | 23.8 |
Expected future benefit payments in 2020 | 21.6 |
Expected future benefit payments in 2021 | 22.3 |
Expected future benefit payments in 2022 | 23.5 |
Expected future benefit payments in 2023-2027 | 124.0 |
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Employer contributions | 4.3 | $ 4.2
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity |  |
Expected future benefit payments in 2018 | 3.2 |
Expected future benefit payments in 2019 | 3.0 |
Expected future benefit payments in 2020 | 2.8 |
Expected future benefit payments in 2021 | 2.6 |
Expected future benefit payments in 2022 | 2.4 |
Expected future benefit payments in 2023-2027 | $ 10.4 |

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