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Basis of Presentation and Summary of Significant Accounting Policies - Leases (Details) $ in Millions | 12 Months Ended
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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: |