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Goodwill and Intangible Assets - Amortization Expense (Details) - EnLink Midstream Partners, LP
$ in Millions
Mar. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2017 (remaining) $ 88.4
2018 117.9
2019 117.9
2020 117.9
2021 117.9
Thereafter 1,034.7
Total $ 1,594.7