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Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Multi-Employer Plan |  |  |
Minimum percentage of the Plan's total contributions contributed by the entity | 5.00% | 5.00% | 5.00%
Employer contribution | $ 2.0 | $ 2.5 | $ 2.1
Expected contribution in 2020 | $ 2.0 |  |
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 | $ 233.8 | $ 214.3 |
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) | 20.50% | 13.80% |
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% |  |
Collective-Bargaining Arrangement |  |  |
Multi-Employer Plan |  |  |
Multiemployer Plans, Collective-Bargaining Arrangement, Description | The collective bargaining agreement was renewed on November 20, 2020 retroactively to October 1, 2020 for a five-year term. |  |
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 | $ 26.1 | $ 21.5 |
Accumulated benefit obligation in excess of plan assets | $ 18.6 | 14.6 |
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 Pri-2012 White Collar Healthy Annuitant Mortality Table with Improvement Scale MP-2019 and for the U.K. Plan the S3PXA base table with future improvements in line with the CMI 2019 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) | 1.50% |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Total accumulated benefit obligation | $ 194.7 | 162.3 |
Fair value of plan assets | 226.3 | 207.5 |
Defined Benefit Retirement Plans |  |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss |  |  |
Amounts unrelated to service costs, benefit | 3.1 | 4.2 | 4.8
Defined Benefit Retirement Plans | U.S. Plans |  |  |
Amounts recognized on the balance sheet: |  |  |
Expected employer contribution in next fiscal year | $ 3.4 |  |
Defined Benefit Plan Tax Status Extensible List | us-gaap:NonqualifiedPlanMember |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Total accumulated benefit obligation | $ 23.3 | 19.9 |
Defined Benefit Retirement Plans | European Plans |  |  |
Amounts recognized in Accumulated Other Comprehensive Loss: |  |  |
Fair value of plan assets | 233.8 | $ 214.3 | $ 184.3
U.S. Postretirement Plans |  |  |
Amounts recognized on the balance sheet: |  |  |
Expected employer contribution in next fiscal year | $ 0.4 |  |

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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 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 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 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 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://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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