Segment and Geographical Area Information (Details) (Table 1) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) segments	Sep. 30, 2025 USD ($)
Segment Reporting [Line Items]
Consolidated revenue	$ 672.1	$ 617.4	$ 1,980.1	$ 1,804.4
Number of Operating Segments \| segments			7
Number of Reportable Segments \| segments			5
Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	606.8	567.5	$ 1,792.1	1,655.0
Reportable Segment Profitability	228.2	194.7	656.5	567.3
Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Consolidated revenue	222.5	211.1	659.8	619.5
Compensation Expense, Excluding Cost of Good and Service Sold	61.3	60.7	194.5	176.6
Segment Reporting, Other Segment Item, Amount	57.0	56.7	169.8	165.8
Morningstar Data and Analytics Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	104.2	93.7	295.5	277.1
PitchBook Segment
Segment Reporting [Line Items]
Consolidated revenue	175.6	169.0	522.7	499.2
Compensation Expense, Excluding Cost of Good and Service Sold	81.0	77.0	239.7	229.4
Segment Reporting, Other Segment Item, Amount	42.3	39.1	126.1	111.8
PitchBook Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	52.3	52.9	156.9	158.0
Morningstar Credit Segment
Segment Reporting [Line Items]
Consolidated revenue	59.4	62.1	313.7	187.7
Compensation Expense, Excluding Cost of Good and Service Sold	24.8	27.0	74.5	85.9
Segment Reporting, Other Segment Item, Amount	27.2	32.0	82.3	96.5
Morningstar Credit Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	7.4	3.1	20.9	5.3
Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	107.8	91.1	177.7	249.1
Compensation Expense, Excluding Cost of Good and Service Sold	51.1	48.6	145.4	128.2
Segment Reporting, Other Segment Item, Amount	16.1	14.4	48.0	40.9
Morningstar Wealth Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	40.6	28.1	120.3	80.0
Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	41.5	34.2	118.2	99.5
Compensation Expense, Excluding Cost of Good and Service Sold	12.3	11.5	36.7	34.4
Segment Reporting, Other Segment Item, Amount	5.5	5.8	18.6	18.2
Morningstar Retirement Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	23.7	16.9	62.9	46.9
License-based
Segment Reporting [Line Items]
Consolidated revenue	459.0	435.0	1,359.0	1,281.4
License-based \| Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	416.5	402.1	1,236.2	1,184.8
License-based \| Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Consolidated revenue	222.4	211.1	658.2	618.0
License-based \| PitchBook Segment
Segment Reporting [Line Items]
Consolidated revenue	173.8	166.9	517.0	493.4
License-based \| Morningstar Credit Segment
Segment Reporting [Line Items]
Consolidated revenue	13.5	18.3	18.6	57.1
License-based \| Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	6.4	5.4	41.2	15.0
License-based \| Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	0.4	0.4	1.2	1.3
Asset-based
Segment Reporting [Line Items]
Consolidated revenue	103.0	84.7	294.9	252.8
Asset-based \| Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	80.3	69.0	230.3	204.7
Asset-based \| Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Consolidated revenue	0.0	0.0	0.0	0.0
Asset-based \| PitchBook Segment
Segment Reporting [Line Items]
Consolidated revenue	0.0	0.0	0.0	0.0
Asset-based \| Morningstar Credit Segment
Segment Reporting [Line Items]
Consolidated revenue	39.2	35.2	0.0	106.5
Asset-based \| Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	0.0	0.0	113.3	0.0
Asset-based \| Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	41.1	33.8	117.0	98.2
Transaction-based
Segment Reporting [Line Items]
Consolidated revenue	110.1	97.7	326.2	270.2
Transaction-based \| Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	110.0	96.4	325.6	265.5
Transaction-based \| Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Consolidated revenue	0.1	0.0	1.6	1.5
Transaction-based \| PitchBook Segment
Segment Reporting [Line Items]
Consolidated revenue	1.8	2.1	5.7	5.8
Transaction-based \| Morningstar Credit Segment
Segment Reporting [Line Items]
Consolidated revenue	6.7	8.6	295.1	24.1
Transaction-based \| Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	101.4	85.7	23.2	234.1
Transaction-based \| Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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