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Employee Benefit and Retirement Plans - Summary of Components of Pension and Postretirement Benefits Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0.6 | $ 0.6 | $ 2.0 | $ 2.0
Interest cost | 12.6 | 12.2 | 37.9 | 32.3
Expected return on plan assets | (18.3) | (18.8) | (55.0) | (49.4)
Amortization, net | 6.0 | 5.5 | 17.8 | 16.3
Net periodic cost | 0.9 | (0.5) | 2.7 | 1.2
International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1.9 | 1.9 | 5.6 | 5.0
Interest cost | 3.4 | 4.7 | 10.1 | 14.2
Expected return on plan assets | (4.7) | (5.7) | (13.9) | (17.0)
Amortization, net | 0.7 | 3.5 | 1.9 | 4.9
Net periodic cost | 1.3 | 4.4 | 3.7 | 7.1
Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 0.1 | 0.1 | 0.1
Interest cost | 0.5 | 0.6 | 1.6 | 1.6
Amortization, net | (2.2) | (2.7) | (6.8) | (7.9)
Net periodic cost | $ (1.7) | $ (2.0) | $ (5.1) | $ (6.2)

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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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