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Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Defined Benefit Retirement Plans |  |  |  |  |
Amounts recognized on the balance sheet: |  |  |  |  |
Amounts unrelated to service costs, benefit | $ 0.9 | $ 0.6 | $ 2.0 | $ 1.1 |
Defined Benefit Retirement Plans | U.S. |  |  |  |  |
Amounts recognized on the balance sheet: |  |  |  |  |
Employer contribution to defined benefit retirement plans |  |  | 0.8 | 0.2 |
Expected employer contribution in full current year | $ 4.6 |  | $ 4.6 |  |
Net amortization gain deferral |  | $ (0.1) |  | $ (0.2) |
Defined Benefit Plan, Tax Status [Extensible List] | us-gaap:NonqualifiedPlanMember | us-gaap:NonqualifiedPlanMember | us-gaap:NonqualifiedPlanMember | us-gaap:NonqualifiedPlanMember | us-gaap:NonqualifiedPlanMember
Defined Benefit Retirement Plans | European |  |  |  |  |
Amounts recognized on the balance sheet: |  |  |  |  |
Employer contribution to defined benefit retirement plans |  |  | $ 2.5 | $ 2.0 |
Expected employer contribution in full current year | $ 5.0 |  | 5.0 |  |
Net amortization gain deferral | (0.1) | $ (0.1) | (0.2) | (0.2) |
Postretirement Health Care and Life Insurance Benefit Plans |  |  |  |  |
Amounts recognized on the balance sheet: |  |  |  |  |
Employer contribution to defined benefit retirement plans |  |  | 0.3 | 0.2 |
Expected employer contribution in full current year | 0.4 |  | 0.4 |  |
Net amortization gain deferral | $ 0.6 | $ 0.3 | $ 0.9 | $ 0.6 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of defined benefit plan cost (credit), classified as other. + References No definition available. + Details
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- Definition Indicates tax status of defined benefit plan designed to provide retirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 + Details
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