Long-term debt, outstanding

No definition available.

Name:	morn_LongTermDebtOutstanding
Namespace Prefix:	morn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

+ References

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

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

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+ Details

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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

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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).

+ References

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

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details

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

- Definition

Amount of long-term debt classified as other.

+ References

+ Details

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

Credit Arrangements (Details) - USD ($) $ in Millions		6 Months Ended
Credit Arrangements (Details) - USD ($) $ in Millions	May 06, 2022	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2022	Oct. 26, 2020
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 650.0
Remaining borrowing capacity		$ 510.0
Long-term debt, outstanding		489.8
Debt Instrument, Interest Rate, Stated Percentage					2.32%
Long-term debt		838.8	$ 698.6
Medium-term Notes [Member] \| Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Long-term debt		$ 349.8	349.8
Line of Credit [Member] \| Credit Agreement [Member] \| Maximum [member] \| Lender's base rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate debt		0.38%
Line of Credit [Member] \| Credit Agreement [Member] \| Maximum [member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate debt		1.48%
Line of Credit [Member] \| Credit Agreement [Member] \| Minimum [Member] \| Lender's base rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate debt		0.00%
Line of Credit [Member] \| Credit Agreement [Member] \| Minimum [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate debt		1.00%
Line of Credit [Member] \| July 2019 Revolving Credit Facility [Member] \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term debt			$ 0.0
Line of Credit [Member] \| May 6, 2022 Credit Agreement \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years
Maximum borrowing capacity	$ 1,100.0
Line of Credit [Member] \| May 2022 Revolving Credit Facility \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	450.0
Long-term debt		$ 140.0
Line of Credit [Member] \| September 30, 2022, Credit Agreement Second Amendment \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 1,300.0
Notes Payable, Other Payables \| Private Placement
Line of Credit Facility [Line Items]
Other Long-term Debt					$ 350.0
Debt Instrument, Interest Rate, Stated Percentage		2.32%	2.32%
Long-term debt		$ 349.0	$ 348.8
Long-Term Debt \| May 6, 2022 Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 650.0