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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, expense recognized |  | $ 11.1 | $ 9.8 | $ 8.4
Inactive participants In defined benefit plan |  | 99.00% |  |
Benefit obligation, discount rate |  | 25.00% |  |
Decrease in expense for all pension plans |  | $ (0.3) |  |
Hedge Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Quarterly redemption restriction notice period |  | 65 days |  |
Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to defined benefit plan assets |  | $ 106.9 | $ 19.8 |
Benefit obligation, discount rate |  | 1.87% | 2.81% | 3.92%
Reduction in projected benefit obligation, mortality assumptions |  | $ (6.0) | $ (8.5) |
Fair value of plan assets exceeded projected benefit obligation of defined benefit plans |  | 3.5 |  |
Projected benefit obligation of defined benefit plans exceeded the fair value of plan assets |  |  | 121.6 |
Accumulated benefit obligation of defined benefit plans |  | $ 555.2 | 547.2 |
Defined Benefit Pension Plan [Member] | Long Term Investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan assets percentage of asset categories |  | 15.00% |  |
Defined Benefit Pension Plan [Member] | Liability Hedging [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan assets percentage of asset categories |  | 83.00% |  |
Defined Benefit Pension Plan [Member] | Short-term Investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan assets percentage of asset categories |  | 2.00% |  |
Defined Benefit Pension Plan [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan percentage of target allocation |  | 25.00% |  |
Defined Benefit Pension Plan [Member] | Public Equity [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan percentage of target allocation |  | 62.00% |  |
Defined Benefit Pension Plan [Member] | Alternate Investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan percentage of target allocation |  | 13.00% |  |
Defined Benefit Pension Plan [Member] | United States [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan contributed amount |  | $ 105.0 |  |
Pension plan minimum contributions |  | 17.0 |  |
Pension plan, voluntary contributions |  | 88.0 |  |
Nonqualified Defined Benefit Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to defined benefit plan assets |  | 1.9 |  |
Nonqualified Defined Benefit Plan [Member] | Scenario, Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to defined benefit plan assets | $ 1.6 |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to defined benefit plan assets |  | $ 1.6 | $ 1.2 |
Benefit obligation, discount rate |  | 1.42% | 2.52% | 3.70%
The year the health care cost reaches ultimate trend rate of 4.5% |  | 2028 |  |
Assumed health care cost trend rate used in measuring the benefit obligation |  | The assumed health care cost trend rate represents the rate at which health care costs are assumed to increase. The assumed health care cost trend rate used in measuring the benefit obligation in 2020 is 6.4% for pre-age 65 retirees and 7.1% for post-age 65 retirees. These rates are assumed to decrease gradually to the ultimate health care cost trend rate of 4.5% in 2028 for both groups. |  |
Other Postretirement Benefits Plan [Member] | Pre Age 65 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assumed health care cost trend rate |  | 6.40% |  |
Other Postretirement Benefits Plan [Member] | Post Age 65 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assumed health care cost trend rate |  | 7.10% |  |

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- Definition Accumulated other comprehensive income loss defined benefit pension and other postretirement plans net of tax, percentage. + References No definition available. + Details
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- Definition Defined benefit plan inactive participants. + References No definition available. + Details
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- Definition Defined contribution plan minimum contribution amount. + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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