Amount equal to net assets from financial covenants.

No definition available.

Name:	mcip_DebtInstrumentCovenantsDescriptionAmountEqualToNetAssetsFromFinancialCovenants
Namespace Prefix:	mcip_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Distributions in cash or property other than common stock percentage.

+ References

No definition available.

+ Details

Name:	mcip_DistributionsInCashPropertyOtherThanCommonStockPercentage
Namespace Prefix:	mcip_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Covenants, Ratio of Total Assets To Total Liabilities

+ References

No definition available.

+ Details

Name:	mcip_LineOfCreditFacilityCovenantsRatioOfTotalAssetsToTotalLiabilities
Namespace Prefix:	mcip_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Covenants, Senior Debt Coverage Ratio

+ References

No definition available.

+ Details

Name:	mcip_LineOfCreditFacilityCovenantsSeniorDebtCoverageRatio
Namespace Prefix:	mcip_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Maximum Borrowing Capacity, Including Accordion Feature

+ References

No definition available.

+ Details

Name:	mcip_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature
Namespace Prefix:	mcip_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of line of credit facility, unused capacity, commitment fee percentage, outstanding borrowings as a percentage of facility amount considered.

+ References

No definition available.

+ Details

Name:	mcip_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentageOutstandingBorrowingsAsAPercentageOfFacilityAmountConsidered
Namespace Prefix:	mcip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage equal to net assets from financial covenants.

+ References

No definition available.

+ Details

Name:	mcip_PercentageEqualToNetAssetsFromFinancialCovenants
Namespace Prefix:	mcip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revolving credit facility maximum borrowing capacity percentage.

+ References

No definition available.

+ Details

Name:	mcip_RevolvingCreditFacilityMaximumBorrowingCapacityPercentage
Namespace Prefix:	mcip_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of net assets (liabilities).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 30
-Topic 205
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479910/205-30-50-1

+ Details

Name:	us-gaap_AssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

+ Details

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

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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

- Definition

Amount, before tax, of unrealized gain (loss) from foreign currency transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-10

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 6
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-6

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(7)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 830
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481956/830-20-45-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 830
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481926/830-20-50-1

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Namespace Prefix:	us-gaap_
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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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 available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of minimum net worth required for mortgage banking as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481586/948-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481586/948-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481586/948-10-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481586/948-10-50-5

+ Details

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

- Details

Name:	us-gaap_TypeOfArrangementAxis=mcip_SeniorSecuredRevolvingCreditFacilityAgreementWithIngCapitalLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mcip_InterestRateScenarioAxis=mcip_InterestRateScenarioOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=mcip_ApplicableBenchmarkRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=mcip_DailySimpleRiskFreeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=mcip_RevolvingCreditFacilityWithAustralianDollarDenominatedBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=mcip_RevolvingCreditFacilityWithBritishPoundDenominatedBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=mcip_RevolvingCreditFacilityWithEurosDenominatedBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=mcip_FourthCreditFacilityAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mcip_CreditFacilityUtilizedPortionOfTheFacilityTrancheAxis=mcip_WhenTheOutstandingBorrowingsAreLessThanOrEqualTo35OfTheFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mcip_CreditFacilityUtilizedPortionOfTheFacilityTrancheAxis=mcip_WhenTheOutstandingBorrowingsAreGreaterThan35OfTheFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=mcip_SOFRCORRAEurocurrencyAndRFRRatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowings - Revolving Credit Facility (Details) € in Thousands, £ in Thousands, $ in Thousands				3 Months Ended
	Nov. 25, 2025 USD ($)	Nov. 24, 2025	Oct. 20, 2023 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2026 AUD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 AUD ($)	Mar. 31, 2026 AUD ($)	Mar. 31, 2026 GBP (£)	Mar. 31, 2026 EUR (€)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 AUD ($)	Dec. 31, 2025 GBP (£)	Dec. 31, 2025 EUR (€)
Line of Credit Facility [Line Items]
Debt				$ 3,296,435,000							$ 3,224,163,000
Unrealized gain (loss) on foreign currency and other transactions				585,000		$ (2,757,000)
Net assets				2,783,366,000		$ 2,442,671,000
Revolving Credit Agreement \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 295,000,000	845,000,000
Accordion feature, total facility amount			$ 800,000,000
Debt				$ 202,501,000							$ 521,800,000
Unrealized gain (loss) on foreign currency and other transactions					$ 605		$ (2,758)
Weighted average interest rate				5.70%				5.70%	5.70%	5.70%	5.80%	5.80%	5.80%	5.80%
Revolving credit facility maximum borrowing capacity percentage			72.50%
Net assets			$ 500,000,000
Amount equal to net assets			$ 1,063,400,000
Percentage equal to net assets			65.00%
Ratio of total assets to total liabilities			1.5
Senior debt coverage ratio			2
Minimum net worth equal required			$ 600,000,000
Distributions in cash or property other than common stock percentage			1.15
Revolving Credit Agreement \| Revolving Credit Facility \| Interest rate in case of any U.S. dollar advances \| Alternate base rate
Line of Credit Facility [Line Items]
Interest rate, basis spread			1.00%
Revolving Credit Agreement \| Revolving Credit Facility \| Interest rate in case of any U.S. dollar advances \| Adjusted Term SOFR
Line of Credit Facility [Line Items]
Interest rate, basis spread			2.00%
Revolving Credit Agreement \| Revolving Credit Facility \| Interest rate in case of any U.S. dollar advances \| Applicable benchmark rate
Line of Credit Facility [Line Items]
Interest rate, basis spread			2.00%
Revolving Credit Agreement \| Revolving Credit Facility \| Interest rate in case of any U.S. dollar advances \| Daily Simple RFR
Line of Credit Facility [Line Items]
Interest rate, basis spread			2.00%
Revolving Credit Agreement \| Revolving Credit Facility With Australian Dollar Denominated Borrowings
Line of Credit Facility [Line Items]
Debt				$ 27,601,000				$ 40,000			$ 26,694,000	$ 40,000
Revolving Credit Agreement \| Revolving Credit Facility With British Pound Denominated Borrowings
Line of Credit Facility [Line Items]
Debt				52,909,000					£ 40,000		53,902,000		£ 40,000
Revolving Credit Agreement \| Revolving Credit Facility With Euros Denominated Borrowings
Line of Credit Facility [Line Items]
Debt				$ 31,740,000						€ 27,472	$ 32,270,000			€ 27,472
Fourth Credit Facility Amendment \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 845,000,000
Accordion feature, total facility amount	$ 1,100,000,000
Fourth Credit Facility Amendment \| Revolving Credit Facility \| When The Outstanding Borrowings Are Less Than Or Equal To 35% Of The Facility
Line of Credit Facility [Line Items]
Commitment fee (in percent)	0.50%
Outstanding borrowings as a percentage of facility amount considered for payment of commitment fee	35.00%
Fourth Credit Facility Amendment \| Revolving Credit Facility \| When The Outstanding Borrowings Are Greater Than 35% Of The Facility
Line of Credit Facility [Line Items]
Commitment fee (in percent)	0.375%
Outstanding borrowings as a percentage of facility amount considered for payment of commitment fee	35.00%
Fourth Credit Facility Amendment \| Revolving Credit Facility \| Alternate base rate
Line of Credit Facility [Line Items]
Interest rate, basis spread	1.00%	1.25%
Fourth Credit Facility Amendment \| Revolving Credit Facility \| SOFR, CORRA , Eurocurrency, And RFR Rates
Line of Credit Facility [Line Items]
Interest rate, basis spread	2.00%	2.25%