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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jan. 07, 2016
Tall Oak
Noncash Transactions
Installment payable discount			$ 79.1
Tall Oak \| EnLink Midstream Partners, LP
Noncash Transactions
Installment payable discount	$ 420.9	$ 79.1
Periodic payment		250.0
Common Units \| Tall Oak
Noncash Transactions
Units issued (in units)	$ 214.9
Common Units \| Coronado \| EnLink Midstream Partners, LP
Noncash Transactions
Units issued (in units)		180.0
Class C Common Unit \| Coronado \| EnLink Midstream Partners, LP
Noncash Transactions
Units issued (in units)		$ 180.0