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Employee Benefit and Retirement Plans - Summary of Pension Plans with Accumulated Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Retirement Benefits [Abstract] |  |
Accumulated benefit obligation | $ 1,783.7 | $ 1,654.8
Fair value of plan assets | $ 1,435.3 | $ 1,297.1

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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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