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Goodwill, Is Not Expected Tax Deductible, Amount Accounts payable Increase (Decrease) in Accounts Payable Adjustments, Other intangible assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Intangible Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Intangible Assets Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Restricted cash included in other current assets Restricted Cash and Cash Equivalent, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Payments to acquire businesses Payments to Acquire Businesses, Gross Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings Per Share, Basic Deferred revenue Deferred revenue - current Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Long-term debt, net Total long-term debt, net of current portion Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Interest rate swaps Interest Rate Contract [Member] Adjustments, Accounts receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, less allowances of $29.1 and $25.6, respectively Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Copper Copper [Member] Copper Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Change in fair value of contingent consideration Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Interest rate swaps & foreign currency exchange forwards Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Share Capital Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Other long-term liabilities Business Combination, Contingent Consideration, Liability Severance and benefits Employee Severance [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Products Product Excluding Spares [Member] Product Excluding Spares Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Hedging Relationship [Domain] Hedging Relationship [Domain] Number of business acquired Business Combination, Number of Businesses Acquired Total liabilities and equity Liabilities and Equity Stock options Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Restructuring costs Restructuring costs Restructuring Charges Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Purchase of short-term investments Payments to Acquire Held-to-Maturity Securities Other non-operating expense (income) Other Nonoperating Income (Expense) DEBT Long-Term Debt [Text Block] Repayment of long-term debt Repayments of Senior Debt Other operating expense (income) Other operating expense (income) Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Debt instrument, covenant, net debt to EBITDA ratio Debt Instrument, Covenant, Net Debt To EBITDA Ratio, Maximum Debt Instrument, Covenant, Net Debt To EBITDA Ratio, Maximum FINANCIAL INSTRUMENTS AND RISK MANAGEMENT Derivatives and Fair Value [Text Block] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Adjustments, Accounts payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock, $0.0001 par value, 5,000,000 shares authorized, none issued and outstanding Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Preliminary valuation adjustment, other net assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Assets Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Foreign currency exchange forwards Foreign currency exchange forwards Foreign Exchange Forward [Member] Steel Steel [Member] Steel Credit Facility [Axis] Credit Facility [Axis] RESTRUCTURING COSTS Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Name Measure Name 0.55% to 5.12% notes (maturities ranging from 2027 to 2036) Senior Notes Due Between 2027 To 2036 [Member] Senior Notes Due Between 2027 To 2036 INCOME TAXES Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Employee 401K match with Vertiv stock (in shares) Stock Issued During Period, Shares, Employee Benefit Plan Debt Instrument [Line Items] Debt Instrument [Line Items] Other current assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total consideration Business Combination, Consideration Transferred Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Changes in operating working capital Supplemental Cash Flow Elements [Abstract] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Raw materials Inventory, Raw Materials, Net of Reserves Contingent consideration transferred Business Combination, Consideration Transferred, Contingent Consideration Business Combination, Consideration Transferred, Contingent Consideration Investments in capitalized software Payments for Software Company Selected Measure Amount Company Selected Measure Amount Depreciation and Amortization Depreciation, Depletion and Amortization Stock-based compensation activity, net of withholding for tax (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Current assets: Assets, Current [Abstract] Total other assets Non-Current Assets, Excluding Property, Plant, And Equipment, Net Non-Current Assets, Excluding Property, Plant, And Equipment, Net Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense (benefit) Income Tax Expense (Benefit) Foreign currency (gain) loss, net Foreign currency gain (loss) Gain (Loss), Foreign Currency Transaction, before Tax Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Asia Pacific Asia Pacific Segment [Member] Asia Pacific Segment Increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Information technology costs Information Technology Expenses Information Technology Expenses Deferred income taxes Business Combination, Recognized Liability Assumed, Deferred Tax Liability AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income (loss) Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Amortization of intangibles Corporate and other Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Restatement Determination Date: Restatement Determination Date [Axis] Exercise of employee stock options Proceeds from Stock Options Exercised Schedule of Activity in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Contract Assets, Liabilities and Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Adjustments, Property, plant and equipment Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Senior Notes due 2066 at 5.950% at June 30, 2026 Senior Notes Due 2066 [Member] Senior Notes Due 2066 Net sales Revenues [Abstract] Debt terms Long-Term Debt, Term BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]