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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranties (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Beginning balance | $ 44.9 | $ 40.0 | $ 37.4
Provision charge to expense | 48.7 | 41.0 | 32.4
Paid/utilized | (50.3) | (36.1) | (29.8)
Ending balance | $ 43.3 | $ 44.9 | $ 40.0

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of provision for product warrant. + References No definition available. + Details
Name: | vrt_ProvisionForProductWarranty
Namespace Prefix: | vrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of provision for product warrant expense during the period. + References No definition available. + Details
Name: | vrt_ProvisionForProductWarrantyExpenseDuringPeriod
Namespace Prefix: | vrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of provision for product warrant paid / utilized during the period. + References No definition available. + Details
Name: | vrt_ProvisionForProuctWarrantyPaidOrUtilized
Namespace Prefix: | vrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration