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Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Cost of Defined Benefit Retirement and Postretirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net periodic benefit costs of defined benefit retirement plans |  |  |
Net periodic pension cost (income) | $ 0.6 | $ 1.6 | $ 2.7
Defined Benefit Retirement Plans | U.S. Plans |  |  |
Net periodic benefit costs of defined benefit retirement plans |  |  |
Service cost | 1.3 | 1.2 | 1.1
Interest cost | 0.6 | 0.6 | 0.5
Net amortization | 0.4 | 0.3 | 1.0
Termination benefits and settlement losses | 0.7 | 0.2 | 0.8
Net periodic pension cost (income) | 3.0 | 2.3 | 3.4
Defined Benefit Retirement Plans | European Plans |  |  |
Net periodic benefit costs of defined benefit retirement plans |  |  |
Service cost | 1.0 | 0.8 | 0.8
Interest cost | 4.6 | 5.4 | 6.1
Expected return on plan assets | (8.4) | (7.6) | (8.4)
Net amortization | 0.3 | 0.6 | 0.8
Termination benefits and settlement losses | 0.1 | 0.1 |
Net periodic pension cost (income) | (2.4) | (0.7) | (0.7)
U.S. Postretirement Plans |  |  |
Net periodic benefit costs of defined benefit retirement plans |  |  |
Interest cost | 0.1 | 0.2 | 0.2
Net amortization | 0.1 | (0.7) | (0.6)
Net periodic pension cost (income) | $ 0.2 | $ (0.5) | $ (0.4)

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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 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 net periodic benefit cost (credit) 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) -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 settlement and curtailment. + 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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