Acquisitions and Divestitures - Pacific Drilling Merger (Details) shares in Millions, $ in Millions		1 Months Ended
	Apr. 15, 2021 shares	Jun. 30, 2021 USD ($) floater
Business Acquisition [Line Items]
Number of floaters acquired		7
Number of floaters sold		2
Pacific Drilling
Business Acquisition [Line Items]
Business acquisition, membership interest conversion ratio	6.366
Business acquisition, warrants conversion ratio	1.553
Number of shares received by acquiree (in shares) | shares	16.6
Proceeds from sale of floaters | $		$ 29.7
Pacific Drilling | Pacific Drilling | Noble Corp
Business Acquisition [Line Items]
Ownership percentage at closing of Merger	24.90%