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Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 405.9	$ 417.0
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	332.6	325.2
Cost, Depreciation	125.0	115.2
General and administrative	29.6	27.9
Total operating expenses	487.2	468.3
OPERATING LOSS	(81.3)	(51.3)
OTHER INCOME (EXPENSE)
Interest income	3.5	3.0
Interest expense, net	(81.0)	(65.6)
Other, net	2.3	(8.1)
Other income (expense), net	(75.2)	(70.7)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(156.5)	(122.0)
PROVISION FOR INCOME TAXES
Current income tax expense	25.6	7.1
Deferred income tax expense	5.9	11.3
Total provision for income taxes	31.5	18.4
LOSS FROM CONTINUING OPERATIONS	(188.0)	(140.4)
LOSS FROM DISCONTINUED OPERATIONS, NET	0.0	(0.1)
NET LOSS	(188.0)	(140.5)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.4)	0.4
NET LOSS ATTRIBUTABLE TO ENSCOROWAN	$ (190.4)	$ (140.1)
EARNINGS (LOSS) PER SHARE - BASIC AND DILUTED
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ (1.75)	$ (1.29)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share	0.00	0.00
Loss Per Share, Basic and Diluted	$ (1.75)	$ (1.29)
WEIGHTED-AVERAGE SHARES OUTSTANDING
Weighted Average Number of Shares Outstanding, Basic and Diluted	108.7	108.4

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