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Employee Benefit and Retirement Plans - Summary of Components of Pension and Postretirement Benefit Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0.7 | $ 0.7 | $ 1.4 | $ 1.4
Interest cost | 12.6 | 12.5 | 25.3 | 20.1
Expected return on plan assets | (18.3) | (19.2) | (36.7) | (30.6)
Amortization, net | 5.9 | 5.4 | 11.8 | 10.8
Net periodic cost | 0.9 | (0.6) | 1.8 | 1.7
International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1.9 | 1.8 | 3.7 | 3.1
Interest cost | 3.4 | 4.9 | 6.7 | 9.5
Expected return on plan assets | (4.7) | (5.8) | (9.2) | (11.3)
Amortization, net | 0.6 | 0.7 | 1.2 | 1.4
Net periodic cost | 1.2 | 1.6 | 2.4 | 2.7
Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.1 |  | 0.1 |
Interest cost | 0.5 | 0.5 | 1.1 | 1.0
Amortization, net | (2.3) | (2.6) | (4.6) | (5.2)
Net periodic cost | $ (1.7) | $ (2.1) | $ (3.4) | $ (4.2)

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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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