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Goodwill and Intangible Assets - Amortization Expense (Details) - EnLink Midstream Partners, LP
$ in Millions
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2020 $ 123.7
2021 123.7
2022 123.7
2023 123.6
2024 123.4
Thereafter 631.8
Total $ 1,249.9