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Subsequent Event (Notes)	9 Months Ended
Subsequent Event (Notes)	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Proposed Merger of Rowan Companies plc and Ensco plc On October 7, 2018, the Company entered into a Transaction Agreement with Ensco plc to effect a "merger-of-equals" transaction (see Note 1). Sale of Rigs to ARO Effective October 1, 2018, the Company sold two jack-ups to ARO (see Note 1).