Debt Instrument, Reduction in Basis Spread on Variable Rate

No definition available.

Name:	apg_DebtInstrumentReductionInBasisSpreadOnVariableRate
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Balance Type:	na
Period Type:	instant

- Definition

Line of credit net of letters of credit outstanding.

+ References

No definition available.

+ Details

Name:	apg_LineOfCreditNetOfLettersOfCreditOutstanding
Namespace Prefix:	apg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unswapped portion of line of credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	apg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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+ Details

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

- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The effective interest rate during the reporting period.

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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

+ Details

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

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

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Period Type:	duration

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- Details

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- Details

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- Details

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- Details

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- Details

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DEBT - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
DEBT - Additional Information (Details) $ in Millions	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2025 USD ($)	Feb. 28, 2024 USD ($)
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity							$ 300
Repayments of long term debt		$ 5	$ 335
Derivative notional amount		4,070		$ 3,004
Acquisition of Construction Equipment and Vehicles
Short-term Debt [Line Items]
Notes payable		5		5
2026 Interest Rate Swap
Short-term Debt [Line Items]
Derivative notional amount		$ 720
Derivative, fixed interest rate		3.59%
Interest rate swaps
Short-term Debt [Line Items]
Derivative notional amount		$ 1,840
Derivative, fixed interest rate		3.41%
2028 Interest Rate Swap
Short-term Debt [Line Items]
Derivative notional amount		$ 400
2029 Interest Rate Swap
Short-term Debt [Line Items]
Derivative notional amount				$ 720
Derivative, fixed interest rate				3.13%
4.125% Senior Notes
Short-term Debt [Line Items]
Total debt obligations					$ 350
Line of credit facility, interest rate	4.125%	4.125%			4.125%
Repurchase amount of senior notes		$ 337
4.750% Senior Notes
Short-term Debt [Line Items]
Total debt obligations					$ 300
Line of credit facility, interest rate	4.75%	4.75%		4.75%	4.75%
Repurchase amount of senior notes		$ 277
2021 Term Loan
Short-term Debt [Line Items]
Total debt obligations		$ 2,157
Debt instrument, reduction in basis spread on variable rate	0.0025			0.0050
2021 Term Loan \| Term loan facility
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity				$ 300
Line of credit facility, increase				550
2021 Term Loan \| Term loan facility \| Interest rate swaps
Short-term Debt [Line Items]
Derivative, fixed interest rate		5.16%
2021 Term Loan \| Term loan facility \| 2029 Interest Rate Swap
Short-term Debt [Line Items]
Derivative notional amount				$ 720
Derivative, fixed interest rate				3.13%
2021 Term Loan \| Term loan facility \| Base Rate
Short-term Debt [Line Items]
Debt, variable interest rate		0.75%
2021 Term Loan \| Term loan facility \| Secured Overnight Financing Rate (SOFR)
Short-term Debt [Line Items]
Debt, variable interest rate		1.75%
2021 Term Loan \| Term loan facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Interest rate swaps
Short-term Debt [Line Items]
Derivative, fixed interest rate		3.41%
Revolving Credit Facility \| Term loan facility
Short-term Debt [Line Items]
Total debt obligations		$ 0		$ 0
Debt instrument term		5 years
Line of credit net letters of credit outstanding		$ 744		494
Letters of credit outstanding		$ 6		6
Repayments of long term debt				100
Revolving Credit Facility \| Term loan facility \| Two Thousand Twenty Two Incremental Amendment
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity	$ 500					$ 750
Debt instrument, reduction in basis spread on variable rate		0.0075
Revolving Credit Facility \| Term loan facility \| Base Rate
Short-term Debt [Line Items]
Debt, variable interest rate		0.50%
Revolving Credit Facility \| Term loan facility \| Secured Overnight Financing Rate (SOFR)
Short-term Debt [Line Items]
Debt, variable interest rate		1.50%
2019 Term Loan
Short-term Debt [Line Items]
Remaining line of credit outstanding (unswapped portion)		$ 1,037
2019 Term Loan \| Term loan facility
Short-term Debt [Line Items]
Repayments of long term debt				$ 330
2019 Term Loan \| Term loan facility \| Interest rate swaps
Short-term Debt [Line Items]
Derivative, fixed interest rate		5.34%
2019 Term Loan \| Term loan facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Interest rate swaps
Short-term Debt [Line Items]
Derivative, fixed interest rate		3.59%
Term loan interest, basis points		1.75%