XML 25 R14.htm IDEA: XBRL DOCUMENT
v3.25.3

CAPITAL CONSTRUCTION FUND | 9 Months Ended
--- | ---
Sep. 30, 2025
CAPITAL CONSTRUCTION FUND |
CAPITAL CONSTRUCTION FUND | 7. CAPITAL CONSTRUCTION FUND ​ The Capital Construction Fund (“CCF”) is described in Note 7 to the Consolidated Financial Statements included in Part II, Item 8 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. A summary of the activities within the CCF cash and cash equivalents, and investments account for the nine months ended September 30, 2025 and 2024 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended
​ | ​ | September 30,
(In millions) |  | 2025 |  | 2024
CCF Cash and Cash Equivalents: | ​ | ​ | ​ | ​ | ​ | ​
CCF cash and cash equivalents balance at beginning of period | ​ | $ | 230.7 | ​ | $ | 599.4
Cash deposits into the CCF | ​ | ​ | — | ​ | ​ | 50.0
Cash withdrawal for the purchase of U.S. Treasury debt securities and accrued interest | ​ | ​ | — | ​ | ​ | (449.8)
Proceeds from U.S. Treasury debt securities at maturity | ​ | ​ | 168.4 | ​ | ​ | —
Interest income on cash and cash equivalents, and CCF investments | ​ | ​ | 13.4 | ​ | ​ | 14.9
Repurchase of assigned accounts receivable | ​ | ​ | 100.7 | ​ | ​ | —
Qualifying withdrawal payments for vessel construction expenditures | ​ | ​ | (136.5) | ​ | ​ | (35.8)
Total CCF cash and cash equivalents balance at end of period | ​ | ​ | 376.7 | ​ | ​ | 178.7
​ | ​ | ​ | ​ | ​ | ​ | ​
CCF Investments: | ​ | ​ | ​ | ​ | ​ | ​
CCF investments balance at beginning of period | ​ | ​ | 411.9 | ​ | ​ | —
Purchase of U.S. Treasury debt securities | ​ | ​ | — | ​ | ​ | 448.1
Sale of U.S. Treasury debt securities at maturity | ​ | ​ | (168.4) | ​ | ​ | —
Accretion of investments | ​ | ​ | 7.7 | ​ | ​ | 8.6
Total CCF investments balance at end of period | ​ | ​ | 251.2 | ​ | ​ | 456.7
Total CCF cash and cash equivalents, and investments balance at end of period | ​ | $ | 627.9 | ​ | $ | 635.4
​ CCF Cash and Cash Equivalents: Cash on deposit in the CCF account is invested in a short-term U.S. Treasury obligations fund with daily liquidity. At September 30, 2025, these short-term securities had a weighted average life of 108 days. ​ CCF Investments: In February 2024, the Company purchased approximately $448.1 million of fixed-rate U.S. Treasuries with accrued interest of $1.7 million using CCF cash. The fixed-rate debt securities were purchased at a discount and have various maturity dates of less than 2 years. The cost of these investments accretes to face value on a straight-line basis until maturity. Such accretion is included in interest income in the Condensed Consolidated Statements of Income and Comprehensive Income. ​ As of September 30, 2025, CCF investments maturities are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | September 30, 2025
Year (in millions) |  | Cost | ​ | Fair Value
Remainder of 2025 | ​ | $ | 27.0 | ​ | $ | 27.0
2026 | ​ |  | 171.8 | ​ |  | 172.4
2027 | ​ |  | 52.4 | ​ |  | 52.8
Total CCF investments | ​ | $ | 251.2 | ​ | $ | 252.2
​ CCF cash and cash equivalents, and investments are classified as a long-term asset in the Company’s Condensed Consolidated Balance Sheets as the Company intends to use withdrawals to fund qualified milestone progress payments for the construction of three new Jones Act vessels. ​ CCF Assigned Accounts Receivable: As of September 30, 2025 and December 31, 2024, eligible accounts receivable of $81.2 million and $178.1 million were assigned to the CCF, respectively. Due to the nature of the assignment of eligible accounts receivable into the CCF, such assigned amounts are classified as part of accounts receivable in the Condensed Consolidated Balance Sheets.

X
- References No definition available. + Details
Name: | matx_CapitalConstructionFundAbstract
Namespace Prefix: | matx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for assets that are restricted in their use, generally by contractual agreements or regulatory requirements. This would include, but not limited to, a description of the restricted assets and the terms of the restriction. + References No definition available. + Details
Name: | us-gaap_RestrictedAssetsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration