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Employee Retirement Plans - Change in Pension Benefits and Other Postretirement Benefits Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Pension Benefits |  |  |
Change in benefit obligations: |  |  |
Benefit obligations — beginning of year | $ 707.7 | $ 614.7 |
Service cost | 11.9 | 10.1 | $ 10.0
Interest cost | 25.0 | 26.8 | 25.5
Actuarial (gain) loss | (19.6) | 83.3 |
Plan amendments | 1.2 | 0.0 |
Curtailment | (3.6) | (1.4) |
Foreign currency | 2.9 | 0.1 |
Benefits paid | (27.7) | (25.9) |
Benefit obligations — end of year | 697.8 | 707.7 | 614.7
Change in plan assets: |  |  |
Fair value of plan assets — beginning of year | 493.7 | 453.8 |
Actual gain on plan assets | 47.0 | 53.4 |
Foreign currency | 1.6 | 0.1 |
Employer contributions | 14.6 | 11.4 |
Benefits paid | (27.7) | (25.0) |
Fair value of plan assets — end of year | 529.2 | 493.7 | 453.8
Funded status of the plans — end of year | (168.6) | (214.0) |
Assets (liabilities) recorded in the balance sheet: |  |  |
Assets in excess of liabilities — included in other noncurrent assets | 0.0 | 0.0 |
Unfunded liabilities — included in other noncurrent liabilities | (168.6) | (214.0) |
Net amount recognized | (168.6) | (214.0) |
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax): |  |  |
Prior service cost (credit) | 0.7 | (0.6) |
Net actuarial loss (gain) | 21.3 | 31.4 |
Total | 22.0 | 30.8 |
Amounts recorded in regulatory assets and liabilities (pre-tax): |  |  |
Prior service cost (credit) | 1.0 | 1.2 |
Net actuarial loss | 139.5 | 181.0 |
Total | 140.5 | 182.2 |
Other Postretirement Benefits |  |  |
Change in benefit obligations: |  |  |
Benefit obligations — beginning of year | 30.9 | 25.4 |
Service cost | 1.0 | 0.7 | 0.7
Interest cost | 0.8 | 0.9 | 0.8
Actuarial (gain) loss | (4.8) | 6.6 |
Plan amendments | 0.0 | (1.5) |
Curtailment | (0.4) | (0.3) |
Foreign currency | 0.4 | 0.0 |
Benefits paid | (0.9) | (0.9) |
Benefit obligations — end of year | 27.0 | 30.9 | 25.4
Change in plan assets: |  |  |
Fair value of plan assets — beginning of year | 13.7 | 12.5 |
Actual gain on plan assets | 1.3 | 1.3 |
Foreign currency | 0.0 | 0.0 |
Employer contributions | 0.6 | 0.6 |
Benefits paid | (0.8) | (0.7) |
Fair value of plan assets — end of year | 14.8 | 13.7 | $ 12.5
Funded status of the plans — end of year | (12.2) | (17.2) |
Assets (liabilities) recorded in the balance sheet: |  |  |
Assets in excess of liabilities — included in other noncurrent assets | 5.4 | 4.1 |
Unfunded liabilities — included in other noncurrent liabilities | (17.6) | (21.3) |
Net amount recognized | (12.2) | (17.2) |
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax): |  |  |
Prior service cost (credit) | (1.5) | (1.5) |
Net actuarial loss (gain) | (0.6) | 3.8 |
Total | (2.1) | 2.3 |
Amounts recorded in regulatory assets and liabilities (pre-tax): |  |  |
Prior service cost (credit) | (1.6) | (2.2) |
Net actuarial loss | 1.2 | 2.4 |
Total | $ (0.4) | $ 0.2 |

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