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AmeriGas Merger and Acquisitions - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 21, 2019 USD ($) $ / shares shares | Aug. 01, 2019 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) propane_distribution_business | Sep. 30, 2017 USD ($)
Total cash paid |  |  | $ 528.9 | $ 0.0 | $ 0.0
Merger Sub |  |  |  |  |
Total cash paid | $ 528.9 |  |  |  |
Incentive distribution, distribution | 2,227.7 |  |  |  |
After tax transaction costs | 7.7 |  |  |  |
Operating expenses | 6.3 |  |  |  |
Deferred tax asset, step up in tax basis of the underlying assets | $ 512.3 |  | $ 512.3 |  |
Merger Sub | Common Stock |  |  |  |  |
Consideration paid (in shares) | shares | 34,612,847 | 34,612,847 | 34,613,000 |  |
CMG |  |  |  |  |
Total cash paid |  | $ 1,284.4 |  |  |
After tax transaction costs |  | $ 15.3 |  |  |
Merger Agreement, Proposed Consideration One | Merger Sub | Common Stock |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per acquiree share (in shares) | shares | 0.500 |  |  |  |
Merger Agreement, Proposed Consideration Two | Merger Sub | Common Stock |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per acquiree share (in shares) | shares | 0.6378 |  |  |  |
Merger Agreement, Proposed Consideration Two | Merger Sub | Cash Without Interest |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per share (in dollars per share) | $ / shares | $ 7.63 |  |  |  |
Merger Agreement, Proposed Consideration Three | Merger Sub | Cash Without Interest |  |  |  |  |
Business combination, consideration transferred, equity interests issuable per share (in dollars per share) | $ / shares | $ 35.325 |  |  |  |
AmeriGas Propane |  |  |  |  |
Total cash paid |  |  |  | 10.1 | 36.8
Incentive distribution, distribution |  |  |  | $ 12.8 | $ 47.6
Number of retail propane distribution businesses acquired | propane_distribution_business |  |  |  | 2 |
Affiliated Entity | CMG | Pennant |  |  |  |  |
Percentage of voting interests acquired |  | 47.00% |  |  |

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