Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fresh Start Accounting - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 30, 2021
Reorganization, Chapter 11 [Line Items]
Cash and cash equivalents	$ 620.5	$ 724.1		$ 607.6
Restricted Cash	15.2	24.4		88.4
Accounts receivable, net	459.3	449.1		425.9
Other	177.2	148.6		90.5
Total current assets	1,272.2	1,346.2		1,212.4
Property, Plant and Equipment, Net	1,633.8	977.2	$ 890.9	909.1
LONG-TERM NOTES RECEIVABLE FROM ARO	282.3	254.0		228.3
INVESTMENT IN ARO	124.4	111.1		80.5
OTHER ASSETS	154.4	116.7		165.3
TOTAL ASSETS	4,322.2	2,860.3		2,595.6
Accounts payable - trade	400.1	256.5		174.1
Accrued Liabilities and Other Liabilities				216.5
Liabilities, Current	744.3	504.4		390.6
Long-term Debt				544.8
Other Liabilities, Noncurrent	471.7	499.5		565.4
Liabilities Not Subject to Compromise				1,500.8
Liabilities Subject to Compromise				0.0
Warrants and Rights Outstanding	16.4	16.4		16.4
Predecessor, Additional Paid In Capital				0.0
Additional paid-in capital	1,119.8	1,097.9		1,078.7
Retained earnings	1,025.5	160.1		0.0
Accumulated other comprehensive income	25.2	14.7		0.0
Treasury Stock, Value				0.0
Total Valaris shareholders' equity	1,987.6	1,289.9		1,095.9
NONCONTROLLING INTERESTS	9.4	8.0		(1.1)
Total equity	1,997.0	1,297.9		1,094.8
Liabilities and Equity	$ 4,322.2	$ 2,860.3		2,595.6
Class A Ordinary Shares, U.S. [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.0
Common Class B, Par Value In GBP [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.0
Common Stock [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.8
Reorganization, Chapter 11, Predecessor, before Adjustment
Reorganization, Chapter 11 [Line Items]
Cash and cash equivalents				280.2
Restricted Cash				45.7
Accounts receivable, net				425.9
Other				370.1
Total current assets				1,121.9
Property, Plant and Equipment, Net				10,026.4
LONG-TERM NOTES RECEIVABLE FROM ARO				442.7
INVESTMENT IN ARO				123.9
OTHER ASSETS				166.4
TOTAL ASSETS				11,881.3
Accounts payable - trade				161.5
Accrued Liabilities and Other Liabilities				290.7
Liabilities, Current				452.2
Long-term Debt				0.0
Other Liabilities, Noncurrent				706.2
Liabilities Not Subject to Compromise				1,158.4
Liabilities Subject to Compromise				7,313.7
Warrants and Rights Outstanding				0.0
Predecessor, Additional Paid In Capital				8,644.0
Additional paid-in capital				0.0
Retained earnings				(5,147.4)
Accumulated other comprehensive income				(93.4)
Treasury Stock, Value				(75.5)
Total Valaris shareholders' equity				3,410.3
NONCONTROLLING INTERESTS				(1.1)
Total equity				3,409.2
Liabilities and Equity				11,881.3
Reorganization, Chapter 11, Predecessor, before Adjustment \| Class A Ordinary Shares, U.S. [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				82.5
Reorganization, Chapter 11, Predecessor, before Adjustment \| Common Class B, Par Value In GBP [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.1
Reorganization, Chapter 11, Predecessor, before Adjustment \| Common Stock [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.0
Reorganization, Chapter 11, Plan Effect Adjustment
Reorganization, Chapter 11 [Line Items]
Cash and cash equivalents				327.4
Restricted Cash				42.7
Accounts receivable, net				0.0
Other				1.5
Total current assets				371.6
Property, Plant and Equipment, Net				(417.6)
LONG-TERM NOTES RECEIVABLE FROM ARO				0.0
INVESTMENT IN ARO				0.0
OTHER ASSETS				(10.0)
TOTAL ASSETS				(56.0)
Accounts payable - trade				13.1
Accrued Liabilities and Other Liabilities				(12.4)
Liabilities, Current				0.7
Long-term Debt				544.8
Other Liabilities, Noncurrent				(55.2)
Liabilities Not Subject to Compromise				490.3
Liabilities Subject to Compromise				(7,313.7)
Common shares, value				0.8
Warrants and Rights Outstanding				16.4
Predecessor, Additional Paid In Capital				(8,644.0)
Additional paid-in capital				1,078.7
Retained earnings				14,322.6
Accumulated other comprehensive income				0.0
Treasury Stock, Value				75.5
Total Valaris shareholders' equity				6,767.4
NONCONTROLLING INTERESTS				0.0
Total equity				6,767.4
Liabilities and Equity				(56.0)
Reorganization, Chapter 11, Plan Effect Adjustment \| Class A Ordinary Shares, U.S. [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				(82.5)
Reorganization, Chapter 11, Plan Effect Adjustment \| Common Class B, Par Value In GBP [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				(0.1)
Reorganization, Chapter 11, Plan Effect Adjustment \| Common Stock [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.8
Reorganization, Chapter 11, Fresh-Start Adjustment
Reorganization, Chapter 11 [Line Items]
Cash and cash equivalents				0.0
Restricted Cash				0.0
Accounts receivable, net				0.0
Other				(281.1)
Total current assets				(281.1)
Property, Plant and Equipment, Net				(8,699.7)
LONG-TERM NOTES RECEIVABLE FROM ARO				(214.4)
INVESTMENT IN ARO				(43.4)
OTHER ASSETS				8.9
TOTAL ASSETS				(9,229.7)
Accounts payable - trade				(0.5)
Accrued Liabilities and Other Liabilities				(61.8)
Liabilities, Current				(62.3)
Long-term Debt				0.0
Other Liabilities, Noncurrent				(85.6)
Liabilities Not Subject to Compromise				(147.9)
Liabilities Subject to Compromise				0.0
Warrants and Rights Outstanding				0.0
Predecessor, Additional Paid In Capital				0.0
Additional paid-in capital				0.0
Retained earnings				(9,175.2)
Accumulated other comprehensive income				93.4
Treasury Stock, Value				0.0
Total Valaris shareholders' equity				(9,081.8)
NONCONTROLLING INTERESTS				0.0
Total equity				(9,081.8)
Liabilities and Equity				(9,229.7)
Reorganization, Chapter 11, Fresh-Start Adjustment \| Class A Ordinary Shares, U.S. [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.0
Reorganization, Chapter 11, Fresh-Start Adjustment \| Common Class B, Par Value In GBP [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				0.0
Reorganization, Chapter 11, Fresh-Start Adjustment \| Common Stock [Member]
Reorganization, Chapter 11 [Line Items]
Common shares, value				$ 0.0