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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. Pension Plans |  |  |
Components of periodic benefit costs |  |  |
Service cost - benefits earned during the year | $ 0.0 | $ 0.0 | $ 0.0
Interest cost of projected benefit obligation | 5.3 | 6.8 | 9.4
Expected return on assets | (4.9) | (5.7) | (9.0)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Amortization of actuarial net loss (gain) | 3.2 | 3.6 | 5.1
Curtailment gain recognized | 0.0 | 0.0 | 0.0
Net periodic benefit cost | $ 3.6 | $ 4.7 | $ 5.5
Weighted average assumptions: |  |  |
Discount rate (as a percent) | 4.20% | 4.50% | 4.10%
Expected return on plan assets (as a percent) | 4.70% | 5.50% | 5.80%
Rate of compensation increase (as a percent) | 0.00% | 0.00% | 0.00%
Non-US Pension Plans |  |  |
Components of periodic benefit costs |  |  |
Service cost - benefits earned during the year | $ 1.9 | $ 1.7 | $ 2.6
Interest cost of projected benefit obligation | 2.1 | 2.5 | 8.9
Expected return on assets | (1.5) | (1.8) | (7.4)
Amortization of prior service cost | 0.1 | 0.1 | 0.1
Amortization of actuarial net loss (gain) | 1.6 | 1.0 | 2.3
Curtailment gain recognized | 0.0 | 0.0 | 0.0
Net periodic benefit cost | $ 4.2 | $ 3.5 | $ 6.5
Weighted average assumptions: |  |  |
Discount rate (as a percent) | 2.10% | 2.90% | 3.30%
Expected return on plan assets (as a percent) | 3.40% | 4.00% | 3.60%
Rate of compensation increase (as a percent) | 2.60% | 2.40% | 3.90%
Postretirement Health and Other |  |  |
Components of periodic benefit costs |  |  |
Service cost - benefits earned during the year | $ 0.3 | $ 0.3 | $ 0.4
Interest cost of projected benefit obligation | 1.0 | 1.7 | 2.0
Expected return on assets | 0.0 | 0.0 | 0.0
Amortization of prior service cost | (1.4) | 0.0 | 0.0
Amortization of actuarial net loss (gain) | 0.4 | 0.0 | 0.1
Curtailment gain recognized | 0.0 | 0.0 | 0.0
Net periodic benefit cost | $ 0.3 | $ 2.0 | $ 2.5
Weighted average assumptions: |  |  |
Discount rate (as a percent) | 3.80% | 4.20% | 3.70%
Expected return on plan assets (as a percent) | 0.00% | 0.00% | 0.00%
Rate of compensation increase (as a percent) | 0.00% | 0.00% | 1.50%

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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 (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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 (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees. + 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 (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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