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Acquisition Of Atwood Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended								9 Months Ended	12 Months Ended
	Oct. 06, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Earnings per share - basic and diluted (in usd per share)		$ (0.47)	$ (0.33)	$ (0.35)	$ (0.32)	$ (0.49)	$ (0.08)	$ (0.15)	$ (0.09)		$ (1.47)		$ (0.91)	$ 3.13
Merger-related costs, excluded from revenue and EPS											$ 80.7
Bargain purchase gain										$ 142.0	$ 1.8		$ 140.2	$ 0.0
Atwood Oceanics, Inc.
Business Acquisition [Line Items]
Revenues													2,226.0	3,622.1
Net income (loss)													$ (347.0)	$ 1,284.9
Earnings per share - basic and diluted (in usd per share)													$ (0.80)	$ 3.18
Bargain purchase gain	$ 140.2											$ 1.8

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