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Employee Benefit Plans - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |
Number of pension plans | plan | 2 |
Estimated contributions in the next fiscal year | $ 2.9 |
Accumulated benefit obligation | 134.0 | $ 127.0
Underfunded status of plan | $ 18.3 | $ 21.6
U.K. Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Maximum increase in pensionable earnings | 2.00% |
Funded percentage (less than) | 100.00% |
U.K. Plan | Global return fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 22.00% |
U.K. Plan | Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 6.40% |
U.K. Plan | Liability Driven Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 20.00% |
U.K. Plan | Corporate bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 13.00% |
U.K. Plan | U.K | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 4.80% |
U.K. Plan | Other Than United Kingdom | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 33.00% |
Canadian Plan | Corporate bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 36.00% |
Canadian Plan | Canada | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 20.00% |
Canadian Plan | Other Than Canada | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation in debt securities | 44.00% |

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- Definition Defined Benefit Plan, Plan Amendments, Maximum Annual Increase for Pensionable Earnings While Plan is Not 100 Percent Funded + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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