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Partnership Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Distribution Made to Limited Partner |  |  |
Partnership distributions to partners (days following quarter end) | 45 days |  |
Percentage of limited partnership interest (as a percent) | 98.00% |  |
General Partner held a general partner interest (as a percent) | 2.00% |  |
Quarterly distribution (in dollars per share) | $ 0.55 |  |
First target distribution (in dollars per share) | 0.055 |  |
Available cash for per common unit (more than) (in dollars per share) | 0.605 | $ 0.605 | $ 0.605
Threshold for increased distribution to General Partner (in dollars per share) | $ 0.605 |  |
Pre-Incentive distribution of available cash to General Partners | 2.00% | 2.00% | 2.00%
General Partners distribution based on ownership interest | $ 54.9 | $ 54.9 | $ 52.7
Incentive distributions received by the General Partner | $ 45.7 | $ 45.3 | $ 43.5
AmeriGas Partners |  |  |
Distribution Made to Limited Partner |  |  |
General Partner held a general partner interest (as a percent) | 1.00% |  |
AmeriGas OLP |  |  |
Distribution Made to Limited Partner |  |  |
General Partner held a general partner interest (as a percent) | 1.01% |  |

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