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Guarantee Of Registered Securities (Condensed Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
NET INCOME (LOSS)	$ (1,108.8)	$ 407.3	$ (4,116.5)	$ 219.3
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	4.8	(1.6)	(8.1)	(1.6)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	(10.9)	1.8	(11.0)	3.4
Other			(0.4)	(0.1)
NET OTHER COMPREHENSIVE INCOME (LOSS)	(6.1)	0.2	(19.5)	1.7
COMPREHENSIVE INCOME (LOSS)	(1,114.9)	407.5	(4,136.0)	221.0
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1.4	(1.8)	2.8	(4.2)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO VALARIS	(1,113.5)	405.7	(4,133.2)	216.8
Valaris plc
NET INCOME (LOSS)	(1,107.4)	405.5	(4,113.7)	215.1
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other			0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)	(1,107.4)	405.5	(4,113.7)	215.1
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO VALARIS	(1,107.4)	405.5	(4,113.7)	215.1
ENSCO International Incorporated
NET INCOME (LOSS)	17.1	15.4	(67.9)	15.5
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	4.8	(1.6)	(8.1)	(1.6)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	(10.9)	1.8	(11.0)	3.4
Other			0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	(6.1)	0.2	(19.1)	1.8
COMPREHENSIVE INCOME (LOSS)	11.0	15.6	(87.0)	17.3
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO VALARIS	11.0	15.6	(87.0)	17.3
Pride International LLC
NET INCOME (LOSS)	(9.0)	6.7	(22.9)	12.3
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other			0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)	(9.0)	6.7	(22.9)	12.3
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO VALARIS	(9.0)	6.7	(22.9)	12.3
Other Non-Guarantor Subsidiaries of Valaris
NET INCOME (LOSS)	(1,001.0)	(199.0)	(4,314.8)	(307.3)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other			(0.4)	(0.1)
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	(0.4)	(0.1)
COMPREHENSIVE INCOME (LOSS)	(1,001.0)	(199.0)	(4,315.2)	(307.4)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1.4	(1.8)	2.8	(4.2)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO VALARIS	(999.6)	(200.8)	(4,312.4)	(311.6)
Consolidating Adjustments
NET INCOME (LOSS)	991.5	178.7	4,402.8	283.7
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other			0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)	991.5	178.7	4,402.8	283.7
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO VALARIS	$ 991.5	$ 178.7	$ 4,402.8	$ 283.7

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