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Net Periodic Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Domestic Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | $ 0.0 | $ 0.0 | $ 0.0
Interest cost | 5.1 | 5.9 | 0.3
Expected return on plan assets | (6.2) | (6.6) | (7.6)
Settlement and curtailment losses (gains) | 0.0 | 0.0 | 0.0
Amortization of: |  |  |
Prior service cost (credit) | 0.0 | 0.0 | 0.0
Net actuarial losses | 1.5 | 1.3 | 6.5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 0.4 | $ 0.6 | $ (0.8)
Discount rate | 4.20% | 4.80% | 4.15%
Expected return on plan assets | 7.00% | 7.00% | 7.00%
Discount rate | 3.70% | 4.20% | 4.80%
Foreign Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | $ 4.9 | $ 6.7 | $ 11.1
Interest cost | 13.5 | 15.1 | 18.9
Expected return on plan assets | (17.7) | (18.7) | (20.6)
Settlement and curtailment losses (gains) | 6.8 | 0.4 | (0.2)
Amortization of: |  |  |
Prior service cost (credit) | 0.1 | 0.1 | 0.1
Net actuarial losses | 5.5 | 4.2 | 4.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 13.1 | $ 7.8 | $ 13.4
Discount rate | 2.52% | 3.61% | 3.41%
Rate of compensation increase | 2.36% | 3.18% | 2.99%
Expected return on plan assets | 4.66% | 5.38% | 5.01%
Discount rate | 2.36% | 2.52% | 3.61%
Rate of compensation increase | 2.37% | 2.36% | 3.25%
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | $ 0.0 | $ 0.0 | $ 0.0
Interest cost | 1.3 | 1.5 | 1.5
Expected return on plan assets | 0.0 | 0.0 | 0.0
Settlement and curtailment losses (gains) | 0.0 | 0.0 | 0.0
Amortization of: |  |  |
Prior service cost (credit) | (0.2) | (0.2) | (0.1)
Net actuarial losses | 0.0 | 0.0 | 0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 1.1 | $ 1.3 | $ 1.4
Discount rate | 4.05% | 4.65% | 4.00%
Discount rate | 3.65% | 4.05% | 4.65%
Health care cost trend rate assumed for next year | 6.50% | 6.75% | 7.00%
Year ultimate rate is reached | 2024 | 2024 | 2024
Ultimate rate | 5.00% | 5.00% | 5.00%

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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