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Defined Benefit Pension and Other Postretirement Plans | 6 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Defined Benefit Pension and Other Postretirement Plans | Note 11 — Defined Benefit Pension and Other Postretirement Plans In the U.S., we sponsor a defined benefit pension plan for employees hired prior to January 1, 2009, of UGI, UGI Utilities, PNG, CPG and certain of UGI’s other domestic wholly owned subsidiaries (“U.S. Pension Plan”). We also provide postretirement health care benefits to certain retirees and postretirement life insurance benefits to nearly all U.S. active and retired employees. In addition, employees of UGI France SAS and its subsidiaries are covered by certain defined benefit pension and postretirement plans. Net periodic pension expense and other postretirement benefit costs include the following components:
|  | Pension Benefits |  | Other Postretirement Benefits
Three Months Ended March 31, |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 2.8 |  |  | $ | 3.0 |  |  | $ | 0.2 |  |  | $ | 0.3 |
Interest cost |  | 6.5 |  |  | 6.1 |  |  | 0.2 |  |  | 0.2 |
Expected return on assets |  | (8.6 | ) |  | (8.3 | ) |  | (0.2 | ) |  | (0.1 | )
Amortization of: |  |  |  |  |  |  |  |
Prior service cost (benefit) |  | 0.1 |  |  | — |  |  | — |  |  | (0.2 | )
Actuarial loss |  | 3.3 |  |  | 4.2 |  |  | — |  |  | — |
Net benefit cost |  | 4.1 |  |  | 5.0 |  |  | 0.2 |  |  | 0.2 |
Change in associated regulatory liabilities |  | — |  |  | — |  |  | (0.1 | ) |  | (0.1 | )
Net benefit cost after change in regulatory liabilities |  | $ | 4.1 |  |  | $ | 5.0 |  |  | $ | 0.1 |  |  | $ | 0.1 |
|  | Pension Benefits |  | Other Postretirement Benefits
Six Months Ended March 31, |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 5.6 |  |  | $ | 6.0 |  |  | $ | 0.4 |  |  | $ | 0.5 |
Interest cost |  | 13.0 |  |  | 12.3 |  |  | 0.4 |  |  | 0.4 |
Expected return on assets |  | (17.2 | ) |  | (16.6 | ) |  | (0.4 | ) |  | (0.3 | )
Amortization of: |  |  |  |  |  |  |  |
Prior service cost (benefit) |  | 0.2 |  |  | 0.1 |  |  | (0.1 | ) |  | (0.3 | )
Actuarial loss |  | 6.6 |  |  | 8.3 |  |  | — |  |  | 0.1 |
Net benefit cost |  | 8.2 |  |  | 10.1 |  |  | 0.3 |  |  | 0.4 |
Change in associated regulatory liabilities |  | — |  |  | — |  |  | (0.2 | ) |  | (0.2 | )
Net benefit cost after change in regulatory liabilities |  | $ | 8.2 |  |  | $ | 10.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |
The U.S. Pension Plan’s assets are held in trust and consist principally of publicly traded, diversified equity and fixed income mutual funds and, to a much lesser extent, UGI Common Stock. It is our general policy to fund amounts for U.S. Pension Plan benefits equal to at least the minimum required contribution set forth in applicable employee benefit laws. During the six months ended March 31, 2018 and 2017, the Company made cash contributions to the U.S. Pension Plan of $6.7 and $5.7, respectively. The Company expects to make additional discretionary cash contributions of approximately $6.7 to the U.S. Pension Plan during the remainder of Fiscal 2018. UGI Utilities has established a Voluntary Employees’ Beneficiary Association (“VEBA”) trust to pay retiree health care and life insurance benefits by depositing into the VEBA the annual amount of postretirement benefits costs, if any. The difference between such cash deposits or expense recorded and amounts included in UGI Gas’ and Electric Utility’s rates, if any, is deferred for future recovery from, or refund to, ratepayers. There were no required contributions to the VEBA during the six months ended March 31, 2018 and 2017. We also sponsor unfunded and non-qualified supplemental executive defined benefit retirement plans. Net periodic costs associated with these plans for the three and six months ended March 31, 2018 and 2017, were not material.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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