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Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure |  |  |
Amortization of prior service credits | $ 0.3 |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Expected amortization of net actuarial losses | 15.0 |  |
ABO for the pension plans | 658.5 | $ 572.8 |
Contribution made to Pension Plan | 12.4 | 16.2 |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 750.1 | 669.2 | $ 697.8
Pre-tax cost to sponsor unfunded and non-qualified supplemental executive retirement plans | 8.5 | 16.0 | 18.9
Net actuarial loss | 25.4 | 14.0 |
Fair value of pension and other postretirement benefit contributions | 0.0 | 0.0 |
Supplemental Employee Retirement Plans |  |  |
Defined Benefit Plan Disclosure |  |  |
Expected amortization of net actuarial losses | 0.9 |  |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 52.9 | 48.3 |
Pre-tax cost to sponsor unfunded and non-qualified supplemental executive retirement plans | 2.2 | 4.3 | 3.1
Settlement |  | 2.1 |
Net actuarial loss | 9.1 | 4.3 |
Fair value of pension and other postretirement benefit contributions | 33.8 | 34.3 |
U.S. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Contribution made to Pension Plan | $ 11.5 | $ 15.1 | $ 11.4

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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