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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0.7 | $ 0.8 | $ 1.4 | $ 1.6
Interest cost | 66.5 | 64.0 | 133.2 | 128.0
Expected return on plan assets | (80.9) | (87.0) | (162.1) | (174.2)
Amortization of prior service benefit | (1.3) | (1.7) | (2.5) | (3.2)
Recognized net actuarial loss | 37.6 | 42.0 | 75.2 | 84.1
Net periodic pension expense (benefit)/postretirement benefit expense | 22.6 | 18.1 | 45.2 | 36.3
Pension Plans | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0
Interest cost | 49.3 | 46.6 | 98.5 | 93.2
Expected return on plan assets | (54.5) | (57.6) | (109.0) | (115.2)
Amortization of prior service benefit | (0.7) | (0.7) | (1.3) | (1.3)
Recognized net actuarial loss | 29.0 | 31.2 | 57.9 | 62.4
Net periodic pension expense (benefit)/postretirement benefit expense | 23.1 | 19.5 | 46.1 | 39.1
Pension Plans | International Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.7 | 0.8 | 1.4 | 1.6
Interest cost | 17.2 | 17.4 | 34.7 | 34.8
Expected return on plan assets | (26.4) | (29.4) | (53.1) | (59.0)
Amortization of prior service benefit | (0.6) | (1.0) | (1.2) | (1.9)
Recognized net actuarial loss | 8.6 | 10.8 | 17.3 | 21.7
Net periodic pension expense (benefit)/postretirement benefit expense | (0.5) | (1.4) | (0.9) | (2.8)
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.1 | 0.1 | 0.2 | 0.3
Interest cost | 1.2 | 1.2 | 2.4 | 2.4
Expected return on plan assets | (0.1) | (0.1) | (0.2) | (0.2)
Amortization of prior service benefit | (0.4) | (0.3) | (0.8) | (0.8)
Recognized net actuarial loss | 0.2 | 0.2 | 0.3 | 0.5
Net periodic pension expense (benefit)/postretirement benefit expense | $ 1.0 | $ 1.1 | $ 1.9 | $ 2.2

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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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