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Shareholders' Equity (Share Issuance Narrative) (Details) - USD ($)			3 Months Ended			9 Months Ended	12 Months Ended
	Oct. 06, 2017	Oct. 05, 2017	Jun. 30, 2018	Dec. 31, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Shares Issuance [Line Items]
Document Period End Date							Dec. 31, 2018
Shares Issued, Price Per Share			$ 9.25
Stock Issued During Period, Shares, New Issues			65,550,000	1,822,432				1,822,432
Proceeds from (Repurchase of) Equity			$ 585,500,000
Debt Instrument, Repurchased Face Amount							$ 721,800,000
Gain (Loss) on Extinguishment of Debt					$ 6,200,000		(19,000,000)	$ (2,600,000)	$ 287,800,000
Stock Repurchase Program, Authorized Amount				$ 2,000,000,000.0			$ 500,000,000.0	$ 2,000,000,000.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				35,000,000.0			65,000,000.0	35,000,000.0
Stock Repurchased During Period, Shares								0
Atwood Oceanics, Inc.
Shares Issuance [Line Items]
Business Combination, Consideration Transferred	$ 770,700,000	$ 781,800,000				$ 781,800,000
Class A Ordinary Shares, U.S. [Member] | Atwood Oceanics, Inc.
Shares Issuance [Line Items]
Number of ordinary shares		132,200,000
Shares Issued, Price Per Share		$ 5.83
Senior Notes [Member]
Shares Issuance [Line Items]
Debt Instrument, Repurchased Face Amount										$ 194,100,000
Senior Notes [Member] | 5.75% Senior notes due 2044
Shares Issuance [Line Items]
Debt Instrument, Repurchased Face Amount				$ 24,500,000				$ 24,500,000
Gain (Loss) on Extinguishment of Debt								$ 8,800,000
Maximum [Member]
Shares Issuance [Line Items]
Common Stock, Shares Authorized							145,600,000
Maximum [Member] | Private Placement [Member]
Shares Issuance [Line Items]
Common Stock, Shares Authorized							291,200,000

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