Debt Instrument, Covenant, Net Leverage Ratio, Maximum

No definition available.

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Data Type:	xbrli:decimalItemType
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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

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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.

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- 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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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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- 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 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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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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- Definition

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

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- 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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- 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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- 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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- 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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- 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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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

No definition available.

+ 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 ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Aug. 15, 2024 USD ($)	Jan. 02, 2020 USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs				$ 17.4		$ 18.2
Debt Instrument, Covenant, Unrestricted Cash, Maximum				150.0
Term loan
Debt Instrument [Line Items]
Long-Term Debt, Gross				698.2		700.0
Senior Notes due 2032
Debt Instrument [Line Items]
Estimated fair value				610.0
Debt issuance costs		$ 8.2
Senior Notes due 2032 \| Unsecured Debt
Debt Instrument [Line Items]
Long-Term Debt, Gross		$ 600.0		600.0		600.0
Interest rate		6.875%
Senior Notes due 2029
Debt Instrument [Line Items]
Estimated fair value				374.9
Debt issuance costs			$ 6.6
Senior Notes due 2029 \| Unsecured Debt
Debt Instrument [Line Items]
Long-Term Debt, Gross			$ 400.0	400.0		400.0
Interest rate			4.375%
Term loan
Debt Instrument [Line Items]
Long-Term Debt, Gross	$ 700.0			$ 700.0
Debt Instrument, Quarterly Amortization Payment Rate				0.25%
Term loan \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
SOFR variable rate spread				2.25%
Revolving Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 700.0			$ 600.0	$ 500.0
Revolving credit facility				0.0		0.0
Line of credit facility, remaining borrowing capacity				$ 699.9
SOFR variable rate spread				2.00%
Line of credit facility, unused commitment fee percent				0.35%
Unamortized debt issuance costs				$ 3.4
Borrowings under revolving credit facility					$ 160.0
Debt issuance costs						1.9
Repayments of Lines of Credit	$ 100.0
Revolving Credit Facility \| Revolving credit facility \| Fourth Quarter 2024
Debt Instrument [Line Items]
Debt Instrument, Covenant, Net Leverage Ratio				5.00
Revolving Credit Facility \| Revolving credit facility \| July 1, 2025 to December 31, 2025
Debt Instrument [Line Items]
Debt Instrument, Covenant, Net Leverage Ratio				4.50
Revolving Credit Facility \| Revolving credit facility \| January 1, 2026 to August 23, 2028
Debt Instrument [Line Items]
Debt Instrument, Covenant, Net Leverage Ratio				4.00
Revolving Credit Facility \| Revolving credit facility \| Up to four fiscal quarters upon material acquisition
Debt Instrument [Line Items]
Debt Instrument, Covenant, Net Leverage Ratio				4.50
Revolving Credit Facility \| Revolving credit facility \| Minimum
Debt Instrument [Line Items]
Line of credit facility, unused commitment fee percent				0.20%
Revolving Credit Facility \| Revolving credit facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
SOFR variable rate spread				0.25%
Revolving Credit Facility \| Revolving credit facility \| Minimum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
SOFR variable rate spread				1.25%
Revolving Credit Facility \| Revolving credit facility \| Maximum
Debt Instrument [Line Items]
Line of credit facility, unused commitment fee percent				0.45%
Revolving Credit Facility \| Revolving credit facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
SOFR variable rate spread				1.50%
Revolving Credit Facility \| Revolving credit facility \| Maximum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
SOFR variable rate spread				2.50%
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, amount				$ 0.1