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Acquisition of Totalgaz (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2015
EUR (€)
Nov. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
competitor
Mar. 31, 2016
EUR (€)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Business Acquisition              
Long-term debt           $ 3,639.0 $ 3,428.7
Number of competitors challenging agreement | competitor       2      
Totalgaz SAS              
Business Acquisition              
Recognized direct transaction costs     $ 7.2 $ 11.0      
Totalgaz SAS | France SAS              
Business Acquisition              
Adjustment to working capital € 1,100,000 $ 1.2          
Totalgaz SAS | France SAS | 2015 Senior Facilities Agreement | Term Loan              
Business Acquisition              
Long-term debt | €         € 600,000,000