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Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Multi-Employer Plan |  |  |
Minimum percentage of the Plan's total contributions contributed by the entity | 5.00% | 5.00% | 5.00%
Employer contribution | $ 1.9 | $ 2.1 | $ 2.2
Expected contribution in 2018 | $ 2.1 |  |
U.S. retirement saving plan |  |  |
Total plan assets invested in active corporate bond funds (as a percent) | 100.00% | 100.00% |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Fair value of plan assets | $ 201.8 | $ 171.4 |
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2017 |  |  |
Assumed annual rate of increase in the per capita cost of covered health care benefits for medical care (as a percent) | 7.00% |  |
Assumed annual rate of increase in the per capita cost of covered health care benefits for dental and vision care (as a percent) | 5.00% |  |
Ultimate annual rate of increase in the per capita cost of covered health care benefits for medical care (as a percent) | 4.75% |  |
Ultimate annual rate of increase in the per capita cost of covered health care benefits for dental and vision care (as a percent) | 5.00% |  |
Equity Funds |  |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Fair value of plan assets | $ 56.3 | $ 53.8 |
Diversified Growth Funds |  |  |
U.S. retirement saving plan |  |  |
Total plan assets invested in active corporate bond funds (as a percent) | 23.80% | 24.10% |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Fair value of plan assets | $ 48.0 | $ 41.2 |
Liability Driven Investments |  |  |
U.S. retirement saving plan |  |  |
Total plan assets invested in active corporate bond funds (as a percent) | 19.20% | 20.10% |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Fair value of plan assets | $ 38.7 | $ 34.4 |
U.S. Retirement Savings Plan |  |  |
U.S. retirement saving plan |  |  |
Maximum percentage of employee's annual compensation allowed as contribution to individual 401(k) retirement saving account (as a percent) | 75.00% |  |
Employer contribution as a percentage of employee contribution (as a percent) | 50.00% |  |
Employer matching contribution as a percentage of employee's annual compensation (as a percent) | 3.00% |  |
U.S. Retirement Savings Plan | Minimum |  |  |
U.S. retirement saving plan |  |  |
Additional employer contribution as a percentage of eligible income depending on employee's age (as a percent) | 2.00% |  |
Maximum employer contribution to individual 401(k) retirement saving account, after additional contribution (as a percent) | 5.00% |  |
U.S. Retirement Savings Plan | Maximum |  |  |
U.S. retirement saving plan |  |  |
Employer matching contribution as a percentage of employee's annual compensation (as a percent) | 4.50% |  |
Additional employer contribution as a percentage of eligible income depending on employee's age (as a percent) | 4.00% |  |
Maximum employer contribution to individual 401(k) retirement saving account, after additional contribution (as a percent) | 7.00% |  |
UK Defined Contribution Pension Plan |  |  |
U.S. retirement saving plan |  |  |
Percentage of pensionable salary that eligible employees can elect to contribute under the first option | 3.00% |  |
Percentage of pensionable salary that eligible employees can elect to contribute under the second option | 5.00% |  |
Percentage of pensionable salary that eligible employees can elect to contribute under the third option | 7.00% |  |
Company's contribution under the first option (as a percent) | 5.00% |  |
Company's contribution under the second option (as a percent) | 9.00% |  |
Company's contribution under the third option (as a percent) | 13.00% |  |
European Plans |  |  |
U.S. retirement saving plan |  |  |
Expected long-term weighted average rate of return for next fiscal year (as a percent) | 3.00% |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Total accumulated benefit obligation | $ 20.9 | 17.7 |
Accumulated benefit obligation in excess of plan assets | $ 14.3 | 12.0 |
United Kingdom defined benefit plan (the U.K. Plan) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long term trend rate of improvement | 1.50% |  |
U.S. retirement saving plan |  |  |
Expected long-term weighted average rate of return for next fiscal year (as a percent) | 4.75% |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Total accumulated benefit obligation | $ 163.1 | 141.8 |
Fair value of plan assets | $ 195.3 | 165.7 |
United Kingdom defined benefit plan (the U.K. Plan) | Equity Funds |  |  |
U.S. retirement saving plan |  |  |
Total plan assets invested in active corporate bond funds (as a percent) | 28.00% |  |
United Kingdom defined benefit plan (the U.K. Plan) | Diversified Growth Funds |  |  |
U.S. retirement saving plan |  |  |
Total plan assets invested in active corporate bond funds (as a percent) | 24.00% |  |
United Kingdom defined benefit plan (the U.K. Plan) | Liability Driven Investments |  |  |
U.S. retirement saving plan |  |  |
Total plan assets invested in active corporate bond funds (as a percent) | 19.00% |  |
Defined Benefit Retirement Plans |  |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income |  |  |
Estimated net actuarial gain (loss) to be recognized as a component of net periodic pension cost | $ (0.2) |  |
Defined Benefit Retirement Plans | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contribution in next fiscal year | 4.6 |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Total accumulated benefit obligation | 21.0 | 17.9 |
Defined Benefit Retirement Plans | European Plans |  |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Fair value of plan assets | 201.8 | 171.4 | $ 160.4
U.S. Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contribution in next fiscal year | 0.5 |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income |  |  |
Estimated net actuarial gain (loss) to be recognized as a component of net periodic pension cost | 1.0 |  |
U.S. Non-qualified Defined Benefit Retirement Plans |  |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Defined benefit retirement plans and postretirement benefit plans included within accrued compensation and benefits | 5.3 | 2.0 |
Defined benefit retirement plans and postretirement benefit plans included within other non-current liabilities | $ 40.1 | $ 38.8 |

X
- Definition An assumption as to the rate of return on plan assets for next fiscal year, reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition 1) For defined benefit pension plans, the current benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the current benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References No definition available. + Details
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- Definition 1) For defined benefit pension plans, the noncurrent benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the noncurrent benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References No definition available. + Details
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- References No definition available. + Details
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- Definition For defined benefit plans, this element represents the assumed annual rate of increase in the per capita cost of covered health care benefits for dental and vision care. + References No definition available. + Details
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- Definition For defined benefit plans, this element represents the assumed annual rate of increase in the per capita cost of covered health care benefits for medical care. + References No definition available. + Details
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- Definition Defined benefit plan long term rate of improvement. + References No definition available. + Details
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- Definition The amount of excess accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References No definition available. + Details
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- Definition For defined benefit plans, this element represents the ultimate annual rate of increase in the per capita cost of covered health care benefits for dental and vision care. + References No definition available. + Details
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- Definition For defined benefit plans, this element represents the ultimate annual rate of increase in the per capita cost of covered health care benefits for medical care under defined benefit plans. + References No definition available. + Details
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- Definition Percentage of employee gross pay, by the terms of the plan that the employer may contribute to a defined contribution plan under the first option. + References No definition available. + Details
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- Definition Percentage of employee gross pay, by the terms of the plan that the employer may contribute to a defined contribution plan under the third option. + References No definition available. + Details
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- Definition Percentage of employee gross pay, by the terms of the plan that the employer may contribute to a defined contribution plan under the second option. + References No definition available. + Details
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- Definition For defined contribution plans, this element represent the maximum percentage of employee's annual compensation allowed as contribution to individual 401(k) retirement saving account. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer will contribute a matching contribution to the defined contribution plan under the first option. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer will contribute a matching contribution to the defined contribution plan under the third option. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer will contribute a matching contribution to the defined contribution plan under the second option. + References No definition available. + Details
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- Definition For defined contribution plans, this element represents the maximum employer contribution to individual 401(k) retirement saving account, low end of range. + References No definition available. + Details
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- Definition For defined contribution plans, this element represents the additional employer contribution as a percentage of eligible income depending on employee's age. + References No definition available. + Details
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- Definition For defined contribution plans, this element represent the employer contribution as a percentage of employee contribution. + References No definition available. + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the multiemployer plan during the next fiscal year beginning from the date of the latest statement of financial position. + References No definition available. + Details
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- Definition Represents the minimum percentage of contributions made under a collective bargaining arrangement to all contributions required of an employer related to a pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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