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Pension Benefit Obligations - Excess of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
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United States |  |  |
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets |  |  |
Projected benefit obligation | $ 610.4 | $ 658.4 | $ 694.8
Accumulated benefit obligation | 610.4 | 658.4 | 694.8
Fair values of plan assets | 451.5 | 466.4 | 453.2
Expected employer contributions in next fiscal year | 14.3 |  |
Foreign Pension Plan, Defined Benefit |  |  |
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets |  |  |
Projected benefit obligation | 1,002.6 | 1,158.3 | 1,220.3
Accumulated benefit obligation | 991.9 | 1,145.7 | 1,215.7
Fair values of plan assets | 760.7 | $ 804.2 | $ 782.1
Expected employer contributions in next fiscal year | $ 27.2 |  |

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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