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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | $ 4,100.0 | $ 3,740.9 |
Other comprehensive income (loss) before reclassification adjustments (after-tax) | (102.5) | (19.1) | $ 67.6
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | 4.1 | 3.6 | (8.3)
Reclassification adjustments tax expense (benefit) | (1.2) | (1.5) | 2.0
Reclassification adjustments (after-tax) | 2.9 | 2.1 | (6.3)
Other comprehensive income (loss) attributable to UGI | (99.6) | (17.0) | 61.3
Balance, end of year | 3,827.2 | 4,100.0 | 3,740.9
Postretirement Benefit Plans |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (11.0) | (19.2) | (29.1)
Other comprehensive income (loss) before reclassification adjustments (after-tax) | (13.0) | 10.4 | 6.5
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | 1.7 | (3.3) | 5.5
Reclassification adjustments tax expense (benefit) | (0.5) | 1.1 | (2.1)
Reclassification adjustments (after-tax) | 1.2 | (2.2) | 3.4
Other comprehensive income (loss) attributable to UGI | (11.8) | 8.2 | 9.9
Reclassification of stranded income tax effects related to TCJA | (2.9) |  |
Balance, end of year | (25.7) | (11.0) | (19.2)
Derivative Instruments |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (16.1) | (21.4) | (13.4)
Other comprehensive income (loss) before reclassification adjustments (after-tax) | (7.3) | 1.0 | 1.7
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | 2.4 | 6.9 | (13.8)
Reclassification adjustments tax expense (benefit) | (0.7) | (2.6) | 4.1
Reclassification adjustments (after-tax) | 1.7 | 4.3 | (9.7)
Other comprehensive income (loss) attributable to UGI | (5.6) | 5.3 | (8.0)
Reclassification of stranded income tax effects related to TCJA | (3.7) |  |
Balance, end of year | (25.4) | (16.1) | (21.4)
Foreign Currency |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (83.3) | (52.8) | (112.2)
Other comprehensive income (loss) before reclassification adjustments (after-tax) | (82.2) | (30.5) | 59.4
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | 0.0 | 0.0 | 0.0
Reclassification adjustments tax expense (benefit) | 0.0 | 0.0 | 0.0
Reclassification adjustments (after-tax) | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) attributable to UGI | (82.2) | (30.5) | 59.4
Reclassification of stranded income tax effects related to TCJA | 0.0 |  |
Balance, end of year | (165.5) | (83.3) | (52.8)
Accumulated other comprehensive income (loss) |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (110.4) | (93.4) | (154.7)
Amounts reclassified from AOCI: |  |  |
Reclassification of stranded income tax effects related to TCJA | (6.6) | 0.0 | 0.0
Balance, end of year | $ (216.6) | $ (110.4) | $ (93.4)

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