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Employee Benefit Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Pension Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost | $ 10.1 | $ 9.1 | $ 10.5
Interest cost | 17.1 | 18.7 | 17.9
Expected return on plan assets | (20.6) | (19.9) | (20.1)
Amortization of prior service cost (benefit) | 1.6 | 1.7 | 1.8
Curtailment/settlement | 0.1 | 1.2 |
Amortization of net actuarial loss (gain) | 3.3 | 0.2 | 1.9
Expenses paid | 4.0 | 2.5 | 1.9
Net periodic benefit cost | 15.6 | 13.5 | 13.9
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial loss (gain) | 29.4 | 63.3 | (35.9)
Prior service cost (benefit) | 9.8 | 0.2 |
Amortization of prior service benefit (cost) | (1.6) | (1.7) | (1.8)
Amortization of net actuarial (loss) gain | (3.3) | (0.2) | (1.9)
Total | $ 34.3 | $ 61.6 | $ (39.6)
Weighted-average assumptions |  |  |
Discount rate | 3.17% | 4.18% | 3.85%
Expected return on plan assets | 5.49% | 5.50% | 5.93%
Postretirement Health and Other |  |  |
Components of net periodic benefit cost |  |  |
Service cost | $ 3.5 | $ 3.1 | $ 3.7
Interest cost | 1.6 | 1.9 | 1.8
Amortization of prior service cost (benefit) | (0.9) | (1.5) | (0.9)
Amortization of net actuarial loss (gain) | (0.2) | (0.2) | 0.1
Net periodic benefit cost | 4.0 | 3.3 | 4.7
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial loss (gain) | 5.5 | 1.4 | (6.5)
Prior service cost (benefit) | (6.5) |  | (0.6)
Amortization of prior service benefit (cost) | 0.9 | 1.5 | 0.9
Amortization of net actuarial (loss) gain | 0.2 | 0.2 | (0.1)
Total | $ 0.1 | $ 3.1 | $ (6.3)
Weighted-average assumptions |  |  |
Discount rate | 3.10% | 4.20% | 3.71%

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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