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Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Pension Benefits [Member] | United States Pension Plan of US Entity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 0.2 | $ 0.7
Interest cost | 11.8 | 12.6
Expected return on plan assets | (16.9) | (18.3)
Amortization, net | 5.4 | 5.9
Net periodic pension cost | 0.5 | 0.9
Pension Benefits [Member] | International [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 1.6 | 1.8
Interest cost | 3.4 | 3.3
Expected return on plan assets | (4.0) | (4.5)
Amortization, net | 0.7 | 0.6
Curtailment, settlement and termination (benefit) costs | 0.3 |
Net periodic pension cost | 2.0 | 1.2
Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0.1 |
Interest cost | 0.5 | 0.6
Amortization, net | (2.6) | (2.3)
Net periodic pension cost | $ (2.0) | $ (1.7)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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