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Shareholders Equity Narrative (Details) shares in Millions	9 Months Ended
	Sep. 30, 2022 shares
Shareholders' Equity [Abstract]
Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation	100.0

X

- Definition

Number of shares of common stock subject to repurchase or cancellation determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period. Common stock subject to repurchase are outstanding common shares that are contingently returnable (that is, subject to recall).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e2646-109256

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Shareholders' Equity [Abstract]

+ References

No definition available.

+ Details

Name:	val_ShareholdersEquityAbstract
Namespace Prefix:	val_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration