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Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Pension Plan | Domestic Plan |  |
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure |  |
Service Cost | $ 2.3 | $ 2.0
Interest Cost | 19.9 | 21.1
Expected Return on Plan Assets | (26.1) | (25.8)
Amortization of Net Actuarial Loss | 5.4 | 4.9
Amortization of Prior Service Credit | 0.0 | (0.1)
Net Periodic Benefit Cost | 1.5 | 2.1
Pension Plan | Foreign Plan |  |
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure |  |
Service Cost | 0.0 | 0.0
Interest Cost | 1.5 | 1.5
Expected Return on Plan Assets | (2.4) | (2.0)
Amortization of Net Actuarial Loss | 0.2 | 0.2
Amortization of Prior Service Credit | 0.0 | 0.0
Net Periodic Benefit Cost | (0.7) | (0.3)
Other Postretirement Benefits Plan |  |
Defined Benefit Plan and Other Postretirement Benefit Plans Disclosure |  |
Service Cost | 0.0 | 0.0
Interest Cost | 1.2 | 1.5
Expected Return on Plan Assets | (0.1) | (0.2)
Amortization of Net Actuarial Loss | 0.0 | 0.0
Amortization of Prior Service Credit | (0.1) | (0.1)
Net Periodic Benefit Cost | $ 1.0 | $ 1.2

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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 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 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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