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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plan | U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0.2 | $ 0.2 | $ 0.3 | $ 0.4
Interest cost | 12.2 | 11.6 | 24.5 | 23.2
Expected return on plan assets | (14.8) | (16.8) | (29.6) | (33.7)
Amortization, net | 3.9 | 5.3 | 7.7 | 10.7
Net periodic expense | 1.5 | 0.3 | 2.9 | 0.6
Pension Plan | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1.4 | 1.3 | 2.9 | 2.7
Interest cost | 3.1 | 3.1 | 6.3 | 6.4
Expected return on plan assets | (3.2) | (3.9) | (6.5) | (7.9)
Amortization, net | 0.6 | 0.7 | 1.2 | 1.3
Net periodic expense | 1.9 | 1.2 | 3.9 | 2.5
Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.1 | 0.0 | 0.1 | 0.1
Interest cost | 0.4 | 0.4 | 0.9 | 0.9
Amortization, net | (2.3) | (2.5) | (4.7) | (5.1)
Net periodic expense | $ (1.8) | $ (2.1) | $ (3.7) | $ (4.1)

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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/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)(3) -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)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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