Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_ShorttermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Cash Interest Rate, Stated Percentage

+ References

No definition available.

+ Details

Name:	vrt_DebtInstrumentCashInterestRateStatedPercentage
Namespace Prefix:	vrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, PIK Interest Rate, Stated Percentage

+ References

No definition available.

+ Details

Name:	vrt_DebtInstrumentPIKInterestRateStatedPercentage
Namespace Prefix:	vrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrt_TermLoanDue2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrt_TermLoanDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrt_Notes9250Due2024Member
Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_DebtInstrumentAxis=vrt_Notes1000Due2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_DebtInstrumentAxis=vrt_SeniorPIKToggleNotesDue2022Member
Namespace Prefix:
Data Type:	na
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Data Type:	na
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- Details

Name:	us-gaap_DebtInstrumentAxis=vrt_ABLRevolvingCreditFacilityMember
Namespace Prefix:
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- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Financial Instruments and Risk Management - Fair Value and Carrying Value of Debt (Details) - USD ($)	Sep. 30, 2020	Mar. 02, 2020	Jan. 31, 2020	Dec. 31, 2019	Dec. 22, 2017	Nov. 30, 2016	Oct. 17, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate							9.25%
Revolving Credit Facility \| Term Loan due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate		1.00%
Aggregate principal amount		$ 2,200,000,000.0
Revolving Credit Facility \| Term Loan due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal amount					$ 325,000,000.0	$ 2,320,000,000.0
Notes Payable to Banks \| 9.250% Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate			9.25%
Aggregate principal amount			$ 750,000,000.0
Notes Payable to Banks \| 10.00% Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate				10.00%
Aggregate principal amount			120,000,000.0
Senior Notes \| 12.00%/13.00% Senior PIK Toggle Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash interest rate, stated percentage				12.00%
PIK interest rate, stated percentage				13.00%
Aggregate principal amount			$ 500,000,000.0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt, fair value	$ 19,100,000			$ 0
Fair Value \| Revolving Credit Facility \| Term Loan due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	2,134,300,000			0
Fair Value \| Revolving Credit Facility \| ABL Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	100,000,000.0			145,200,000
Fair Value \| Revolving Credit Facility \| Term Loan due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	0			2,064,800,000
Fair Value \| Notes Payable to Banks \| 9.250% Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	0			805,300,000
Fair Value \| Notes Payable to Banks \| 10.00% Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	0			127,500,000
Fair Value \| Senior Notes \| 12.00%/13.00% Senior PIK Toggle Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	0			517,500,000
Par Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term debt, fair value	19,100,000			0
Par Value \| Revolving Credit Facility \| Term Loan due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	2,189,000,000.0			0
Par Value \| Revolving Credit Facility \| ABL Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	100,000,000.0			145,200,000
Par Value \| Revolving Credit Facility \| Term Loan due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	0			2,070,000,000.0
Par Value \| Notes Payable to Banks \| 9.250% Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	0			750,000,000.0
Par Value \| Notes Payable to Banks \| 10.00% Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	0			120,000,000.0
Par Value \| Senior Notes \| 12.00%/13.00% Senior PIK Toggle Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value disclosure	$ 0			$ 500,000,000.0