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Intangible Assets - Amortization Expense (Details) - EnLink Midstream Partners, LP
$ in Millions
Jun. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 (remaining) $ 61.8
2019 123.4
2020 123.4
2021 123.4
2022 123.4
Thereafter 880.0
Total $ 1,435.4