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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0.7 | $ 0.8 | $ 2.1 | $ 2.4
Interest cost | 66.1 | 63.1 | 199.3 | 191.1
Expected return on plan assets | (80.1) | (85.7) | (242.2) | (259.9)
Amortization of prior service benefit | (1.2) | (1.5) | (3.7) | (4.7)
Recognized net actuarial loss | 37.9 | 41.9 | 113.1 | 126.0
Net periodic pension expense (benefit)/postretirement benefit expense | 23.4 | 18.6 | 68.6 | 54.9
Pension Plans | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0
Interest cost | 49.6 | 46.8 | 148.1 | 140.0
Expected return on plan assets | (54.7) | (57.7) | (163.7) | (172.9)
Amortization of prior service benefit | (0.6) | (0.6) | (1.9) | (1.9)
Recognized net actuarial loss | 29.6 | 31.4 | 87.5 | 93.8
Net periodic pension expense (benefit)/postretirement benefit expense | 23.9 | 19.9 | 70.0 | 59.0
Pension Plans | International Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.7 | 0.8 | 2.1 | 2.4
Interest cost | 16.5 | 16.3 | 51.2 | 51.1
Expected return on plan assets | (25.4) | (28.0) | (78.5) | (87.0)
Amortization of prior service benefit | (0.6) | (0.9) | (1.8) | (2.8)
Recognized net actuarial loss | 8.3 | 10.5 | 25.6 | 32.2
Net periodic pension expense (benefit)/postretirement benefit expense | (0.5) | (1.3) | (1.4) | (4.1)
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.1 | 0.2 | 0.3 | 0.5
Interest cost | 1.2 | 1.1 | 3.6 | 3.5
Expected return on plan assets | (0.1) | (0.1) | (0.3) | (0.3)
Amortization of prior service benefit | (0.4) | (0.5) | (1.2) | (1.3)
Recognized net actuarial loss | 0.2 | 0.4 | 0.5 | 0.9
Net periodic pension expense (benefit)/postretirement benefit expense | $ 1.0 | $ 1.1 | $ 2.9 | $ 3.3

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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=118257860&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=118255775&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=118255775&loc=d3e2709-114920 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&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=118255775&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=118255775&loc=d3e2709-114920 + Details
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