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Acquisition of Totalgaz (Details)
$ in Millions
1 Months Ended 3 Months Ended
May. 29, 2015
EUR (€)
Nov. 30, 2015
EUR (€)
Nov. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
competitors
Dec. 31, 2014
USD ($)
Business Acquisition          
Long-term debt       $ 3,609.3 $ 3,488.3
Number of competitors challenging agreement | competitors       2  
Totalgaz SAS          
Business Acquisition          
Recognized direct transaction costs         $ 3.8
France SAS | Totalgaz SAS          
Business Acquisition          
Adjustment to working capital   € 1,100,000 $ 1.2    
Divestiture period following acquisition 15 months        
France SAS | 2015 Senior Facilities Agreement | Term Loan | Totalgaz SAS          
Business Acquisition          
Long-term debt | € € 600,000,000