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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | $ 3,740.9 | $ 3,595.0 |
Other comprehensive loss before reclassification adjustments (after-tax) | (19.1) | 67.6 | $ (34.2)
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | 3.6 | (8.3) | (10.5)
Reclassification adjustments tax (benefit) expense | (1.5) | 2.0 | 4.6
Reclassification adjustments (after-tax) | 2.1 | (6.3) | (5.9)
Other comprehensive income (loss) attributable to UGI | (17.0) | 61.3 | (40.1)
Balance, end of year | 4,100.0 | 3,740.9 | 3,595.0
Postretirement Benefit Plans |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (19.2) | (29.1) | (20.4)
Other comprehensive loss before reclassification adjustments (after-tax) | 10.4 | 6.5 | (10.9)
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | (3.3) | 5.5 | 2.6
Reclassification adjustments tax (benefit) expense | 1.1 | (2.1) | (0.4)
Reclassification adjustments (after-tax) | (2.2) | 3.4 | 2.2
Other comprehensive income (loss) attributable to UGI | 8.2 | 9.9 | (8.7)
Balance, end of year | (11.0) | (19.2) | (29.1)
Derivative Instruments |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (21.4) | (13.4) | 11.2
Other comprehensive loss before reclassification adjustments (after-tax) | 1.0 | 1.7 | (16.5)
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | 6.9 | (13.8) | (13.1)
Reclassification adjustments tax (benefit) expense | (2.6) | 4.1 | 5.0
Reclassification adjustments (after-tax) | 4.3 | (9.7) | (8.1)
Other comprehensive income (loss) attributable to UGI | 5.3 | (8.0) | (24.6)
Balance, end of year | (16.1) | (21.4) | (13.4)
Foreign Currency |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (52.8) | (112.2) | (105.4)
Other comprehensive loss before reclassification adjustments (after-tax) | (30.5) | 59.4 | (6.8)
Amounts reclassified from AOCI: |  |  |
Reclassification adjustments (pre-tax) | 0.0 | 0.0 | 0.0
Reclassification adjustments tax (benefit) expense | 0.0 | 0.0 | 0.0
Reclassification adjustments (after-tax) | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) attributable to UGI | (30.5) | 59.4 | (6.8)
Balance, end of year | (83.3) | (52.8) | (112.2)
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (93.4) | (154.7) | (114.6)
Amounts reclassified from AOCI: |  |  |
Balance, end of year | $ (110.4) | $ (93.4) | $ (154.7)

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