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Goodwill and Intangible Assets (Amortization) (Details) - EnLink Midstream Partners, LP - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amortization expense maturities      
2017 $ 117.9    
2018 117.9    
2019 117.9    
2020 117.9    
2021 117.9    
Thereafter 1,034.7    
Total $ 1,624.2 $ 689.9 $ 533.0