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Employee Benefit and Retirement Plans - Composition of Domestic Pension Plan Assets (Detail) - U.S. - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 1,228.2 | $ 1,104.9
Fair Value Measurements, Subtotal |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 473.2 | 478.7
NAV-based assets |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 755.0 | 626.2
Global equities |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 232.5 | 179.8
Global equities | Fair Value Measurements, Subtotal |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Global equities | NAV-based assets |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 232.5 | 179.8
Fixed income securities and funds |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 730.0 | 682.6
Fixed income securities and funds | Fair Value Measurements, Subtotal |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 400.0 | 413.3
Fixed income securities and funds | NAV-based assets |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 330.0 | 269.3
Alternative investments |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 239.4 | 217.8
Alternative investments | Fair Value Measurements, Subtotal |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 46.9 | 40.7
Alternative investments | NAV-based assets |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 192.5 | 177.1
Other contract |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 26.3 | 24.7
Other contract | Fair Value Measurements, Subtotal |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 26.3 | 24.7
Other contract | NAV-based assets |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 1 |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 456.9 | 462.9
Level 1 | Global equities |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 0.0
Level 1 | Fixed income securities and funds |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 400.0 | 413.3
Level 1 | Alternative investments |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 46.9 | 40.7
Level 1 | Other contract |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 10.0 | 8.9
Level 2 |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 15.2 | 14.8
Level 2 | Global equities |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 0.0
Level 2 | Fixed income securities and funds |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 0.0
Level 2 | Alternative investments |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 0.0
Level 2 | Other contract |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 15.2 | 14.8
Level 3 |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.1 | 1.0
Level 3 | Global equities |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 0.0
Level 3 | Fixed income securities and funds |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 0.0
Level 3 | Alternative investments |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets |  | 0.0
Level 3 | Other contract |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 1.1 | $ 1.0

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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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