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Employee Benefit and Retirement Plans - Composition of International Pension Plan Assets (Detail) - International [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 23.4 | $ 52.9
Equity Securities [Member] | Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14.3 | 38.8
Equity Securities [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 9.1 | 14.1
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 273.3 | 273.2
Fixed Income Securities [Member] | Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 266.7 | 258.8
Fixed Income Securities [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 6.6 | 14.4
Cash and Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 226.9 | 276.0
Cash and Other Investments [Member] | Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 212.6 | 244.2
Cash and Other Investments [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14.3 | 31.8
Fair Value Of Plan Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 523.6 | 602.1
Fair Value Of Plan Assets [Member] | Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 493.6 | 541.8
Fair Value Of Plan Assets [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 30.0 | 60.3
Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14.3 | 38.8
Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 266.7 | 258.8
Level 1 [Member] | Cash and Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 6.2 | 5.1
Level 1 [Member] | Fair Value Of Plan Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 287.2 | 302.7
Level 2 [Member] | Cash and Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 204.9 | 233.7
Level 2 [Member] | Fair Value Of Plan Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 204.9 | 233.7
Level 3 [Member] | Cash and Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.5 | 5.4
Level 3 [Member] | Fair Value Of Plan Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 1.5 | $ 5.4

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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 of investment within defined benefit plan asset category. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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