Committed Bridge Loan Financing

No definition available.

Name:	aca_CommittedBridgeLoanFinancing
Namespace Prefix:	aca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Net Leverage Ratio, Maximum

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Covenant, Unrestricted Cash, Maximum

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Quarterly Amortization Payment Rate

+ References

No definition available.

+ Details

Name:	aca_DebtInstrumentQuarterlyAmortizationPaymentRate
Namespace Prefix:	aca_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

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

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- 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.

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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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.

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Name:	us-gaap_DerivativeNotionalAmount
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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

No definition available.

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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.

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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

- Definition

The fair value amount of long-term debt 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.

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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the noncurrent portion 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.

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Period Type:	instant

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Period Type:	duration

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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Period Type:	duration

- Details

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- Details

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Debt - Narrative (Details) $ in Millions				3 Months Ended			12 Months Ended
Debt - Narrative (Details) $ in Millions	Oct. 01, 2024 USD ($)	Aug. 26, 2024 USD ($)	Apr. 06, 2021 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 15, 2024 USD ($)	Aug. 01, 2024 USD ($)	Jan. 02, 2020 USD ($)	Jan. 02, 2019 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Covenant, Unrestricted Cash, Maximum				$ 150.0			$ 150.0
Debt issuance costs							23.3	$ 2.0	$ 0.0
Less: unamortized debt issuance costs				18.2			18.2	4.4
Bridge Loan
Debt Instrument [Line Items]
Debt issuance costs					$ 6.2		6.2
Secured Debt \| Bridge Loan
Debt Instrument [Line Items]
Committed bridge loan, unused											$ 1,200.0
Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 700.0			700.0			700.0	0.0
Quarterly principal amortization payments, percent	0.25%
Senior Notes due 2032
Debt Instrument [Line Items]
Debt issuance costs		$ 8.2
Estimated fair value				609.9			609.9
Senior Notes due 2032 \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross		$ 600.0		600.0			600.0	0.0
Interest rate		6.875%
Senior Notes due 2029
Debt Instrument [Line Items]
Debt issuance costs			$ 6.6
Estimated fair value				372.9			372.9
Senior Notes due 2029 \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross			$ 400.0	400.0			400.0	400.0
Interest rate			4.375%
Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity				700.0			$ 700.0			$ 600.0		$ 500.0
SOFR variable rate spread							2.50%
Line of credit commitment fee percentage							0.45%
Revolving credit facility				0.0			$ 0.0	160.0
Credit facility, remaining borrowing capacity				699.3			699.3
Borrowings from revolving credit facility						$ 160.0	335.0	$ 60.0	80.0
Debt issuance costs							1.9
Less: unamortized debt issuance costs				$ 3.7			$ 3.7
Repayments of lines of credit	$ 100.0								$ 155.0
Revolving credit facility \| Revolving credit facility \| October 1, 2024 to June 30, 2025
Debt Instrument [Line Items]
Net leverage ratio				5.00			5.00
Revolving credit facility \| Revolving credit facility \| July 1, 2025 to December 31, 2025
Debt Instrument [Line Items]
Net leverage ratio				4.50			4.50
Revolving credit facility \| Revolving credit facility \| January 1, 2026 to August 23, 2028
Debt Instrument [Line Items]
Net leverage ratio				4.00			4.00
Revolving credit facility \| Revolving credit facility \| Up to four fiscal quarters upon material acquisition
Debt Instrument [Line Items]
Net leverage ratio				4.50			4.50
Revolving credit facility \| Term Loan
Debt Instrument [Line Items]
Debt issuance costs							$ 7.0
Letter of credit \| Revolving credit facility
Debt Instrument [Line Items]
Letters of credit outstanding				$ 0.7			$ 0.7
Interest rate hedges \| Designated as hedging instrument
Debt Instrument [Line Items]
Derivative, notional amount													$ 100.0
Derivative fixed interest rate				2.71%			2.71%
Secured Overnight Financing Rate (SOFR) \| Term Loan
Debt Instrument [Line Items]
SOFR variable rate spread	2.25%
Minimum \| Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit commitment fee percentage				0.20%
Minimum \| Secured Overnight Financing Rate (SOFR) \| Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
SOFR variable rate spread				1.25%
Minimum \| Base Rate \| Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
SOFR variable rate spread				0.25%
Maximum \| Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit commitment fee percentage				0.45%
Maximum \| Secured Overnight Financing Rate (SOFR) \| Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
SOFR variable rate spread				2.50%
Maximum \| Base Rate \| Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
SOFR variable rate spread				1.50%