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Postretirement and Other Benefits - Expected Future Benefit Payments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
UNITED STATES | Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
2018 | $ 8.5 |
2019 | 8.4 |
2020 | 8.3 |
2021 | 8.3 |
2022 | 8.2 |
2023 - 2027 | 39.1 |
Employer contributions | 0.0 | $ 0.0
UNITED STATES | Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
2018 | 0.2 |
2019 | 0.1 |
2020 | 0.1 |
2021 | 0.1 |
2022 | 0.1 |
2023 - 2027 | 0.3 |
Employer contributions | 0.3 | 0.4
FRANCE | Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
2018 | 1.4 |
2019 | 2.1 |
2020 | 0.7 |
2021 | 1.3 |
2022 | 0.9 |
2023 - 2027 | 7.7 |
Employer contributions | $ 1.9 | $ 0.7

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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