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Defined Benefit Pension and Other Postretirement Plans - Components of Net Periodic Pension Expense and Other Postretirement Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | $ 2.8 | $ 3.0 | $ 8.4 | $ 9.0
Interest cost | 6.5 | 6.2 | 19.5 | 18.5
Expected return on assets | (8.7) | (8.4) | (25.9) | (25.0)
Amortization of: |  |  |  |
Prior service cost (benefit) | 0.0 | 0.1 | 0.2 | 0.2
Actuarial loss | 3.4 | 4.2 | 10.0 | 12.5
Net benefit cost | 4.0 | 5.1 | 12.2 | 15.2
Change in associated regulatory liabilities | 0.0 | 0.0 | 0.0 | 0.0
Net benefit cost after change in regulatory liabilities | 4.0 | 5.1 | 12.2 | 15.2
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | 0.2 | 0.3 | 0.6 | 0.7
Interest cost | 0.3 | 0.2 | 0.7 | 0.6
Expected return on assets | (0.2) | (0.2) | (0.6) | (0.5)
Amortization of: |  |  |  |
Prior service cost (benefit) |  | (0.2) | (0.2) | (0.5)
Actuarial loss | 0.0 | 0.1 | 0.0 | 0.2
Net benefit cost | 0.3 | 0.2 | 0.5 | 0.5
Change in associated regulatory liabilities | (0.1) | (0.1) | (0.4) | (0.4)
Net benefit cost after change in regulatory liabilities | $ 0.2 | $ 0.1 | $ 0.1 | $ 0.1

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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 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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