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Commitments and Contingencies - Summary of Future Minimum Operation Lease Payments (Details) - EnLink Midstream Partners, LP
$ in Millions
Dec. 31, 2017
USD ($)
Lessee, Lease, Description [Line Items]  
2018 $ 14.3
2019 10.9
2020 8.6
2021 8.6
2022 8.6
Thereafter 58.6
Total $ 109.6