XML 122 R107.htm IDEA: XBRL DOCUMENT
v3.25.3

Retirement Benefits - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 2,810.0 | $ 2,779.0 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 74.0 | 74.0 | $ 68.0
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,821.0 | 1,800.0 |
U.S. Plans | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,815.0 | 1,790.0 |
U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 772.0 | 688.0 |
U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,043.0 | 1,102.0 |
U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 88.0 | 2.0 |
U.S. Plans | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 88.0 | 2.0 |
U.S. Plans | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Preferred and common stock | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 419.0 | 403.0 |
U.S. Plans | Preferred and common stock | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 419.0 | 403.0 |
U.S. Plans | Preferred and common stock | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Preferred and common stock | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 415.0 | 524.0 |
U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 415.0 | 524.0 |
U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Preferred and corporate debt | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 478.0 | 431.0 |
U.S. Plans | Preferred and corporate debt | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Preferred and corporate debt | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 478.0 | 431.0 |
U.S. Plans | Preferred and corporate debt | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Government securities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 295.0 | 314.0 |
U.S. Plans | Government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 265.0 | 283.0 |
U.S. Plans | Government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 30.0 | 31.0 |
U.S. Plans | Government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 120.0 | 116.0 |
U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 120.0 | 116.0 |
U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Private equity and alternative equity | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 6.0 | 10.0 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 989.0 | 979.0 |
Non-U.S. Plans | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 967.0 | 958.0 |
Non-U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 209.0 | 199.0 |
Non-U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 684.0 | 685.0 |
Non-U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 74.0 | 74.0 |
Non-U.S. Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 8.0 | 6.0 |
Non-U.S. Plans | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 8.0 | 6.0 |
Non-U.S. Plans | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and common stock | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 200.0 | 192.0 |
Non-U.S. Plans | Preferred and common stock | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 200.0 | 192.0 |
Non-U.S. Plans | Preferred and common stock | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and common stock | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 218.0 | 218.0 |
Non-U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 218.0 | 218.0 |
Non-U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and corporate debt | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 79.0 | 80.0 |
Non-U.S. Plans | Preferred and corporate debt | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and corporate debt | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 79.0 | 80.0 |
Non-U.S. Plans | Preferred and corporate debt | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Government securities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1.0 | 1.0 |
Non-U.S. Plans | Government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1.0 | 1.0 |
Non-U.S. Plans | Government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 327.0 | 333.0 |
Non-U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 327.0 | 333.0 |
Non-U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Real estate funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 60.0 | 54.0 |
Non-U.S. Plans | Real estate funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Real estate funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 60.0 | 54.0 |
Non-U.S. Plans | Real estate funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Real estate funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 23.0 | 21.0 |
Non-U.S. Plans | Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 73.0 | 72.0 |
Non-U.S. Plans | Insurance contracts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Insurance contracts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 73.0 | 72.0 | 65.0
Non-U.S. Plans | Other | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1.0 | 2.0 |
Non-U.S. Plans | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 1.0 | $ 2.0 | $ 3.0

X
- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-7 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (m) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 12: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel12And3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rok_CommonAndPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rok_EquityCommonCollectiveTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rok_FixedIncomeCommonCollectiveTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rok_InsuranceContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=rok_OtherPensionPlanInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |