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Employee Benefit Plans - Weighted-Average Assumptions used to Determine Benefit Obligation (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.K. Plan |  |  |
Weighted average actuarial assumptions used to determine the benefit obligation and net periodic benefit cost |  |  |
Discount rate used to calculate benefit obligation (as a percent) | 2.60% | 2.80% | 4.00%
Discount rate used to calculate net periodic pension cost (as a percent) | 2.80% | 4.00% | 3.65%
Rate of compensation increase (as a percent) | 1.00% | 1.00% | 2.00%
Expected return on assets (as a percent) | 4.80% | 5.70% | 6.30%
Canadian Plan |  |  |
Weighted average actuarial assumptions used to determine the benefit obligation and net periodic benefit cost |  |  |
Discount rate used to calculate benefit obligation (as a percent) | 4.00% | 4.00% | 4.15%
Discount rate used to calculate net periodic pension cost (as a percent) | 3.60% | 4.15% | 4.00%
Rate of compensation increase (as a percent) | 3.00% | 3.00% | 3.00%
Expected return on assets (as a percent) | 6.00% | 6.25% | 6.25%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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 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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