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Acquisitions - Acquisition of Totalgaz (Details) $ in Millions |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 29, 2015 EUR (€) | May 29, 2015 USD ($) | Nov. 30, 2015 EUR (€) | Nov. 30, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 4,172.1 | $ 3,795.5 |
Totalgaz SAS |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Transaction related costs |  |  |  |  |  |  | $ 16.1
Totalgaz SAS | France SAS |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total cash paid | € 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 | Term Loan | 2015 Senior Facilities Agreement | France SAS |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Long-term debt | € | € 600,000,000 |  |  |  |  |  |

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