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Acquisitions (Details) $ in Millions			1 Months Ended		12 Months Ended
	May 29, 2015 EUR (€)	May 29, 2015 USD ($)	Nov. 30, 2015 EUR (€)	Nov. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) competitor	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Business Acquisition
Long-term debt					$ 3,795.5	$ 3,667.4
Number of competitors challenging agreement | competitor					2
Totalgaz SAS
Business Acquisition
Transaction related costs						16.1
Totalgaz SAS | France SAS
Business Acquisition
Cash consideration	€ 451,800,000	$ 496.6
Estimated Acquisition Date working capital	30,000,000	$ 33.0
Adjustment to working capital			€ 1,100,000	$ 1.2
Totalgaz SAS | France SAS | Term Loan | 2015 Senior Facilities Agreement
Business Acquisition
Long-term debt | €	€ 600,000,000
Total LPG | Flaga and AvantiGas
Business Acquisition
Cash consideration					$ 24.1
Total LPG | Flaga | Hungary
Business Acquisition
Cash consideration						17.6
Several Retail Propane Distribution Businesses | Amerigas OLP
Business Acquisition
Cash consideration					$ 37.6	$ 20.8	$ 15.7
Retail Natural Gas Marketing Business | Energy Services
Business Acquisition
Cash consideration							$ 20.0

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