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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | $ 3,595.0 | $ 3,565.6 |
Other comprehensive (loss) income before reclassification adjustments (after-tax) | 67.6 | (34.2) | $ (98.5)
Amounts reclassified from AOCI and noncontrolling interests: |  |  |
Reclassification adjustments (pre-tax) | (8.3) | (10.5) | 6.6
Reclassification adjustments tax (benefit) expense | 2.0 | 4.6 | (3.6)
Reclassification adjustments (after-tax) | 6.3 | 5.9 | (3.0)
Other comprehensive income (loss) | 61.3 | (40.1) | (95.5)
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners |  |  | 2.1
Other comprehensive loss attributable to UGI | 61.3 | (40.1) | (93.4)
Balance, end of year | 3,740.9 | 3,595.0 | 3,565.6
Postretirement Benefit Plans |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (29.1) | (20.4) | (20.6)
Other comprehensive (loss) income before reclassification adjustments (after-tax) | 6.5 | (10.9) | (1.2)
Amounts reclassified from AOCI and noncontrolling interests: |  |  |
Reclassification adjustments (pre-tax) | 5.5 | 2.6 | 2.2
Reclassification adjustments tax (benefit) expense | (2.1) | (0.4) | (0.8)
Reclassification adjustments (after-tax) | (3.4) | (2.2) | (1.4)
Other comprehensive income (loss) |  |  | 0.2
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners |  |  | 0.0
Other comprehensive loss attributable to UGI | 9.9 | (8.7) | 0.2
Balance, end of year | (19.2) | (29.1) | (20.4)
Derivative Instruments |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (13.4) | 11.2 | (9.3)
Other comprehensive (loss) income before reclassification adjustments (after-tax) | 1.7 | (16.5) | 16.8
Amounts reclassified from AOCI and noncontrolling interests: |  |  |
Reclassification adjustments (pre-tax) | (13.8) | (13.1) | 4.4
Reclassification adjustments tax (benefit) expense | 4.1 | 5.0 | (2.8)
Reclassification adjustments (after-tax) | 9.7 | 8.1 | (1.6)
Other comprehensive income (loss) |  |  | 18.4
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners |  |  | 2.1
Other comprehensive loss attributable to UGI | (8.0) | (24.6) | 20.5
Balance, end of year | (21.4) | (13.4) | 11.2
Foreign Currency |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (112.2) | (105.4) | 8.7
Other comprehensive (loss) income before reclassification adjustments (after-tax) | 59.4 | (6.8) | (114.1)
Amounts reclassified from AOCI and noncontrolling interests: |  |  |
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) |  |  | (114.1)
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners |  |  | 0.0
Other comprehensive loss attributable to UGI | 59.4 | (6.8) | (114.1)
Balance, end of year | (52.8) | (112.2) | (105.4)
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Including Portion Attributable to NCI [Roll Forward]: |  |  |
Balance, beginning of year | (154.7) | (114.6) | (21.2)
Amounts reclassified from AOCI and noncontrolling interests: |  |  |
Balance, end of year | $ (93.4) | $ (154.7) | $ (114.6)

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