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Goodwill and Intangible Assets - Amortization Expense (Details) - EnLink Midstream Partners, LP
$ in Millions
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2021 $ 123.4
2022 123.4
2023 123.4
2024 123.4
2025 106.1
Thereafter 525.7
Total $ 1,125.4