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Supplemental Financial Information (Repair And Maintenance Expense Related To Continuing Operations) (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Supplemental Financial Information [Abstract]
Repair and maintenance expense	$ 48.4	$ 76.3	$ 203.3	$ 175.2

X

- Definition

The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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Period Type:	duration

X

- Definition

Supplemental Financial Information [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	val_
Data Type:	xbrli:stringItemType
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