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Employee Retirement Plans - Net Periodic Pension Expense and Other Postretirement Benefit Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Service cost | $ 11.2 | $ 11.9 | $ 10.1
Interest cost | 26.3 | 25.0 | 26.8
Expected return on assets | (35.0) | (33.6) | (32.4)
Curtailment gain | (0.2) | (1.4) | (1.2)
Amortization of: |  |  |
Prior service cost (benefit) | 0.3 | 0.3 | 0.3
Actuarial loss (gain) | 13.4 | 16.7 | 10.9
Net benefit cost | 16.0 | 18.9 | 14.5
Change in associated regulatory liabilities | 0.0 | 0.0 | 0.0
Net benefit cost after change in regulatory liabilities | 16.0 | 18.9 | 14.5
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Service cost | 0.5 | 1.0 | 0.7
Interest cost | 0.8 | 0.8 | 0.9
Expected return on assets | (0.7) | (0.7) | (0.6)
Curtailment gain | 0.0 | 0.0 | 0.0
Amortization of: |  |  |
Prior service cost (benefit) | (6.3) | (0.6) | (0.6)
Actuarial loss (gain) | (0.1) | 0.3 | 0.0
Net benefit cost | (5.8) | 0.8 | 0.4
Change in associated regulatory liabilities | (0.5) | (0.5) | 1.0
Net benefit cost after change in regulatory liabilities | $ (6.3) | $ 0.3 | $ 1.4

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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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