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Basis of Presentation and Summary of Significant Accounting Policies - Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Minimum
Lessee, Lease, Description [Line Items]
Increase in Operating Lease Liability	$ 79.0
Increase in Operating Lease Right of Use Asset	78.0
Maximum
Lessee, Lease, Description [Line Items]
Increase in Operating Lease Liability	82.0
Increase in Operating Lease Right of Use Asset	$ 81.0

X

- Definition

Amount of increase in operating lease liability recognized during the period.

+ References

No definition available.

+ Details

Name:	dvh_IncreaseInOperatingLeaseLiability
Namespace Prefix:	dvh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase in operating lease right of use asset recognized during the period.

+ References

No definition available.

+ Details

Name:	dvh_IncreaseInOperatingLeaseRightOfUseAsset
Namespace Prefix:	dvh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: