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Employee Benefit and Retirement Plans - Composition of Domestic Pension Plan Assets (Detail) - United States [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Global Equities [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 179.8 | $ 294.3
Global Equities [Member] | Fair Value [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 205.3
Global Equities [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 179.8 | 89.0
Fixed Income Securities [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 682.6 | 602.9
Fixed Income Securities [Member] | Fair Value [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 413.3 | 395.4
Fixed Income Securities [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 269.3 | 207.5
Alternative Investments [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 217.8 | 173.7
Alternative Investments [Member] | Fair Value [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 40.7 | 23.8
Alternative Investments [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 177.1 | 149.9
Cash and Other Investments [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 24.7 | 200.2
Cash and Other Investments [Member] | Fair Value [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 24.7 | 200.2
Fair Value Of Plan Assets [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1,104.9 | 1,271.1
Fair Value Of Plan Assets [Member] | Fair Value [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 478.7 | 824.7
Fair Value Of Plan Assets [Member] | Portion at Other than Fair Value Measurement [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 626.2 | 446.4
Level 1 [Member] | Global Equities [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 205.3
Level 1 [Member] | Fixed Income Securities [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 413.3 | 395.4
Level 1 [Member] | Alternative Investments [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 40.7 | 23.8
Level 1 [Member] | Cash and Other Investments [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 8.9 | 183.9
Level 1 [Member] | Fair Value Of Plan Assets [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 462.9 | 808.4
Level 2 [Member] | Cash and Other Investments [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14.8 | 15.2
Level 2 [Member] | Fair Value Of Plan Assets [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 14.8 | 15.2
Level 3 [Member] | Cash and Other Investments [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.0 | 1.1
Level 3 [Member] | Fair Value Of Plan Assets [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 1.0 | $ 1.1

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- Definition Pension Plans, Postretirement and Other Employee Benefits [Line Items] + 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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