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Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Multi-Employer Plan |  |  |
Minimum percentage of the Plan's total contributions contributed by the entity | 5.00% | 5.00% | 5.00%
Employer contribution | $ 2.5 | $ 2.1 | $ 1.9
Expected contribution in 2020 | $ 2.5 |  |
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 | $ 214.3 | $ 184.3 |
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2019 |  |  |
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% |  |
Liability Driven Investments |  |  |
U.S. retirement saving plan |  |  |
Total plan assets invested in active corporate bond funds (as a percent) | 13.80% | 17.20% |
Non-Qualified Deferred Compensation Plan |  |  |
U.S. retirement saving plan |  |  |
Employer contribution as a percentage of employee contribution (as a percent) | 50.00% |  |
Maximum | Non-Qualified Deferred Compensation Plan |  |  |
U.S. retirement saving plan |  |  |
Employer matching contribution as a percentage of employee's annual compensation (as a percent) | 6.00% |  |
U.S. Retirement Savings Plan |  |  |
U.S. retirement saving plan |  |  |
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% |  |
Employer matching contribution as a targeted percentage of employee's annual compensation (as a percent) | 3.00% |  |
U.S. Retirement Savings Plan | Maximum |  |  |
U.S. retirement saving plan |  |  |
Percentage of employee's annual compensation allowed as contribution to individual 401(k) retirement saving account (as a percent) | 75.00% |  |
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% |  |
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% |  |
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 | $ 21.5 | $ 20.3 |
Accumulated benefit obligation in excess of plan assets | $ 14.6 | 14.1 |
United Kingdom defined benefit plan (the U.K. Plan) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Long term trend rate of improvement | 1.25% |  |
Description of long term trend rate of improvement | The mortality table used for the U.S. plans is based on the RP-2014 White Collar Healthy Annuitant Mortality Table with Improvement Scale MP-2018 and for the U.K. Plan the S2PXA base table with future improvements in line with the CMI 2018 projection model with a long term trend rate of 1.25% p.a. |  |
U.S. retirement saving plan |  |  |
Expected long-term weighted average rate of return for next fiscal year (as a percent) | 3.20% |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Total accumulated benefit obligation | $ 162.3 | 135.5 |
Fair value of plan assets | 207.5 | 178.1 |
Defined Benefit Retirement Plans |  |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) |  |  |
Estimated net actuarial gain (loss) to be recognized as a component of net periodic pension cost | (0.6) |  |
Estimated net prior service cost to be recognized as a component of net periodic pension cost | 0.1 |  |
Amounts unrelated to service costs, benefit | 4.2 | 4.8 | 1.5
Defined Benefit Retirement Plans | U.S. Plans |  |  |
Amounts recognized on the balance sheet: |  |  |
Expected employer contribution in next fiscal year | $ 1.4 |  |
Defined Benefit Plan Tax Status Extensible List | us-gaap:NonqualifiedPlanMember |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Total accumulated benefit obligation | $ 19.9 | 17.8 |
Defined Benefit Retirement Plans | European Plans |  |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Fair value of plan assets | 214.3 | $ 184.3 | $ 201.8
U.S. Postretirement Plans |  |  |
Amounts recognized on the balance sheet: |  |  |
Expected employer contribution in next fiscal year | 0.5 |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) |  |  |
Estimated net actuarial gain (loss) to be recognized as a component of net periodic pension cost | $ 0.8 |  |

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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 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 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 Defined contribution plan employer matching contribution targeted percent. + 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 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 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=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 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=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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=118257860&loc=d3e4179-114921 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) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: 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=118255775&loc=d3e1928-114920 + 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=118255775&loc=d3e2410-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement 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 (l) -URI http://asc.fasb.org/extlink&oid=118255775&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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- Definition Relevant mortality and surrender rate assumptions that are an integral part of the methodology used in calculating the reserve for future benefits to be paid to or on behalf of policyholders and related expenses less the present value of future net premiums using assumptions such as estimates of expected investment yields, mortality, morbidity, terminations and expenses, applicable at the time the insurance contracts are made and cost of settling insured claims and cost incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=117419472&loc=d3e14931-158439 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(b)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 + Details
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