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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax |  |
Balance, beginning of period | $ 3,740.9 |
Other comprehensive (loss) income before reclassification adjustments (after-tax) | 21.9 | $ (58.6)
Amounts reclassified from AOCI: |  |
Reclassification adjustments (pre-tax) | 0.1 | (5.0)
Reclassification adjustments tax (benefit) expense | (0.1) | 1.5
Reclassification adjustments (after-tax) | 0.0 | (3.5)
Other comprehensive (loss) income attributable to UGI | 21.9 | (62.1)
Balance, end of period | 4,082.1 | 3,733.1
Postretirement Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax |  |
Balance, beginning of period | (19.2) | (29.1)
Other comprehensive (loss) income before reclassification adjustments (after-tax) | 0.0 | 0.0
Amounts reclassified from AOCI: |  |
Reclassification adjustments (pre-tax) | 0.6 | 1.6
Reclassification adjustments tax (benefit) expense | (0.2) | (0.6)
Reclassification adjustments (after-tax) | 0.4 | 1.0
Other comprehensive (loss) income attributable to UGI | 0.4 | 1.0
Balance, end of period | (18.8) | (28.1)
Derivative Instruments |  |
AOCI Attributable to Parent, Net of Tax |  |
Balance, beginning of period | (21.4) | (13.4)
Other comprehensive (loss) income before reclassification adjustments (after-tax) | (0.4) | 12.3
Amounts reclassified from AOCI: |  |
Reclassification adjustments (pre-tax) | (0.5) | (6.6)
Reclassification adjustments tax (benefit) expense | 0.1 | 2.1
Reclassification adjustments (after-tax) | (0.4) | (4.5)
Other comprehensive (loss) income attributable to UGI | (0.8) | 7.8
Balance, end of period | (22.2) | (5.6)
Foreign Currency |  |
AOCI Attributable to Parent, Net of Tax |  |
Balance, beginning of period | (52.8) | (112.2)
Other comprehensive (loss) income before reclassification adjustments (after-tax) | 22.3 | (70.9)
Amounts reclassified from AOCI: |  |
Reclassification adjustments (pre-tax) | 0.0 | 0.0
Reclassification adjustments tax (benefit) expense | 0.0 | 0.0
Reclassification adjustments (after-tax) | 0.0 | 0.0
Other comprehensive (loss) income attributable to UGI | 22.3 | (70.9)
Balance, end of period | (30.5) | (183.1)
Total |  |
AOCI Attributable to Parent, Net of Tax |  |
Balance, beginning of period | (93.4) | (154.7)
Amounts reclassified from AOCI: |  |
Balance, end of period | $ (71.5) | $ (216.8)

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