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Goodwill and Intangible Assets - Amortization Expense (Details) - EnLink Midstream Partners, LP
$ in Millions
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 $ 123.4
2019 123.4
2020 123.4
2021 123.4
2022 123.4
Thereafter 880.1
Total $ 1,497.1