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Employee Benefit and Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer discretionary contribution amount |  | $ 15.6 | $ 17.4 | $ 16.5
Defined contribution plan, cost recognized |  | $ 30.2 | 25.5 | $ 14.0
Fair value, investments, entities that calculate net asset value per share, investment redemption, notice period |  | 90 days |  |
Reclassification of level 3 assets to NAV-based assets |  |  | 42.3 |
Scenario, Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension and other postretirement benefit plans, amounts that will be amortized from AOCI in next fiscal year, pre-tax | $ 13.9 |  |  |
United States Pension Plan of US Entity [Member] | Scenario, Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 13.0 |  |  |
International [Member] | Scenario, Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | $ 16.0 |  |  |
Equity Securities [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, target plan asset allocations range maximum |  | 25.00% |  |
Equity Securities [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, target plan asset allocations range maximum |  | 40.00% |  |
Fixed Income Investments [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, target plan asset allocations range maximum |  | 20.00% |  |
Fixed Income Investments [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, target plan asset allocations range maximum |  | 40.00% |  |
Cash and Other Investments [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, target plan asset allocations range maximum |  | 25.00% |  |
Cash and Other Investments [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, target plan asset allocations range maximum |  | 45.00% |  |
Supplemental Employee Retirement Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net death benefits from life insurance policies, amount |  | $ 274.0 |  |
Cash surrender value of life insurance |  | 123.0 | 116.0 |
Defined benefit plan, benefit obligation |  | $ 127.0 | $ 123.0 |

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- Definition Pension and other postretirement benefit plans, amounts that will be amortized from aoci in next fiscal year, pre-tax. + References No definition available. + Details
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- Definition Reclassification of level 3 assets to NAV-based assets. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 + Details
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- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in current 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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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 (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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