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Employee Benefit Obligations - Summary of Pension Plan Assets as of Measurement Date (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocation, target |  |  | 100.00%
Minimum [Member] | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocation, target |  |  | 0.00%
Minimum [Member] | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocation, target |  |  | 0.00%
Minimum [Member] | Other plan asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocation, target |  |  | 0.00%
Maximum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocation, target |  |  | 60.00%
Maximum | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocation, target |  |  | 40.00%
Maximum | Other plan asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocation, target |  |  | 100.00%
Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 3.4 | $ 2.6 |
Pension plan asset allocations | 100.00% | 100.00% |
Interest cost | $ 4.4 | $ 5.7 |
Recognized net actuarial (gain) loss | $ (22.4) | $ 36.0 |
Non-US [Member] | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 0.00% | 0.00% |
Non-US [Member] | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 19.00% | 23.00% |
Non-US [Member] | Other plan asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 81.00% | 77.00% |
UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0.8 | $ 0.6 |
Pension plan asset allocations | 100.00% | 100.00% |
Interest cost | $ 3.3 | $ 3.7 |
Recognized net actuarial (gain) loss | $ (4.4) | $ 6.8 |
UNITED STATES | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 58.00% | 61.00% |
UNITED STATES | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 39.00% | 36.00% |
UNITED STATES | Other plan asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan asset allocations | 3.00% | 3.00% |
Pension Plan [Member] | Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 3.4 | $ 2.6 | $ 2.6
Interest cost | 4.4 | 5.7 | 6.2
Expected return on assets | 4.2 | 4.2 | 5.2
Amortization of transition obligation | 0.3 | 0.1 | 0.7
Recognized net actuarial (gain) loss | (3.9) | (0.8) | (1.3)
Net periodic cost (benefit) | 7.8 | 5.0 | 5.6
Pension Plan [Member] | UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 0.8 | 0.6 | 0.8
Interest cost | 3.3 | 3.7 | 3.7
Expected return on assets | 5.2 | 5.2 | 5.6
Amortization of transition obligation | 0.0 | 0.0 | 0.0
Recognized net actuarial (gain) loss | (1.6) | (0.7) | (0.2)
Net periodic cost (benefit) | $ 0.5 | $ (0.2) | $ (0.9)

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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 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)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the transition obligation or asset recognized in net periodic benefit cost. + 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)(6) -URI http://asc.fasb.org/extlink&oid=65897934&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 An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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=65897934&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=65897934&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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=65897934&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 (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: 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=65897934&loc=d3e1928-114920 Reference 3: 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=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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