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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