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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 0.8 | $ 1.6
Interest cost | 64.0 | 69.9
Expected return on plan assets | (87.2) | (89.4)
Amortization of prior service benefit | (1.5) | (1.3)
Recognized net actuarial loss | 42.1 | 43.7
Net periodic pension expense (benefit)/postretirement benefit expense | 18.2 | 24.5
Pension Plans | U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0.0 | 0.0
Interest cost | 46.6 | 52.5
Expected return on plan assets | (57.6) | (58.8)
Amortization of prior service benefit | (0.6) | (0.6)
Recognized net actuarial loss | 31.2 | 30.9
Net periodic pension expense (benefit)/postretirement benefit expense | 19.6 | 24.0
Pension Plans | International Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0.8 | 1.6
Interest cost | 17.4 | 17.4
Expected return on plan assets | (29.6) | (30.6)
Amortization of prior service benefit | (0.9) | (0.7)
Recognized net actuarial loss | 10.9 | 12.8
Net periodic pension expense (benefit)/postretirement benefit expense | (1.4) | 0.5
Other Postretirement Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0.2 | 0.1
Interest cost | 1.2 | 1.5
Expected return on plan assets | (0.1) | (0.1)
Amortization of prior service benefit | (0.5) | (0.1)
Recognized net actuarial loss | 0.3 | 0.3
Net periodic pension expense (benefit)/postretirement benefit expense | $ 1.1 | $ 1.7

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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 prior service cost (credit) 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Definition Amount of cost recognized for passage of time related to 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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