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Pensions - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement charges | $ 6,100,000 | $ 0 | $ 6,100,000 | $ 0
Number Of Individuals Elected Lump Sum Settlement |  |  | 516 |
Cost of defined contribution pension plans |  | 7,200,000 | $ 6,900,000 | 6,900,000
U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement charges |  | $ 0 | $ 6,100,000 | $ 0
Weighted-average target return of pension plans |  | 7.00% | 7.10% | 7.50%
Non-U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement charges |  | $ 0 | $ 0 | $ 0
Weighted-average target return of pension plans |  | 4.20% | 4.20% | 4.90%
Expected amortization of actuarial loss in next fiscal year |  | $ 3,300,000 |  |
Expected amortization of prior service cost in next fiscal year |  | 100,000 |  |
Expected contribution to defined benefit plan |  | $ 1,300,000 |  |
Maximum | Equity Securities | U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 73.00% |  |
Maximum | Equity Securities | Non-U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 75.00% |  |
Maximum | Fixed Income Securities | U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 45.00% |  |
Maximum | Cash and Cash Equivalents | U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 20.00% |  |
Maximum | Debt Securities | Non-U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 35.00% |  |
Minimum | U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Weighted-average target return of pension plans |  | 7.00% |  |
Minimum | Equity Securities | U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 53.00% |  |
Minimum | Equity Securities | Non-U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 65.00% |  |
Minimum | Fixed Income Securities | U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 25.00% |  |
Minimum | Cash and Cash Equivalents | U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 0.00% |  |
Minimum | Debt Securities | Non-U.S. Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 25.00% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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