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Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits [Member] | United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0.8 | $ 2.8 | $ 2.7
Interest cost | 46.4 | 49.6 | 44.4
Expected return on plan assets | (67.5) | (73.3) | (69.1)
Prior service cost (credit) | (0.1) | (0.1) | (0.1)
Net actuarial gain (loss) | 21.4 | 23.7 | 21.8
Curtailment, settlement and termination (benefit) costs |  | (3.7) |
Total expense (income) | 1.0 | (1.0) | (0.3)
Pension Benefits [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 5.3 | 6.4 | 6.0
Interest cost | 13.0 | 13.2 | 17.2
Expected return on plan assets | (14.7) | (18.2) | (20.3)
Prior service cost (credit) | 0.4 | 0.4 | 0.5
Net actuarial gain (loss) | 2.0 | 2.0 | 2.4
Curtailment, settlement and termination (benefit) costs | 1.3 | 1.3 | 2.9
Total expense (income) | 7.3 | 5.1 | 8.7
Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 0.3 | 0.1 | 0.1
Interest cost | 1.8 | 2.2 | 2.2
Prior service cost (credit) | (6.6) | (5.2) | (5.2)
Net actuarial gain (loss) | (3.6) | (3.9) | (5.2)
Total expense (income) | $ (8.1) | $ (6.8) | $ (8.1)

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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