Segment and Geographical Area Information (Details) (Table 1) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) segments	Jun. 30, 2025 USD ($)
Segment Reporting [Line Items]
Consolidated revenue	$ 663.2	$ 605.1	$ 1,308.0	$ 1,187.0
Number of Operating Segments \| segments			7
Number of Reportable Segments \| segments			5
Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	599.9	557.4	$ 1,185.3	1,087.5
Reportable Segment Profitability	219.1	198.0	428.3	372.6
Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Consolidated revenue	222.1	209.2	437.3	408.4
Compensation Expense, Excluding Cost of Good and Service Sold	64.6	58.2	133.2	115.9
Segment Reporting, Other Segment Item, Amount	57.2	54.7	112.8	109.1
Morningstar Data and Analytics Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	100.3	96.3	191.3	183.4
PitchBook Segment
Segment Reporting [Line Items]
Consolidated revenue	174.7	166.5	347.1	330.2
Compensation Expense, Excluding Cost of Good and Service Sold	79.3	76.3	158.7	152.4
Segment Reporting, Other Segment Item, Amount	42.4	37.4	83.8	72.7
PitchBook Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	53.0	52.8	104.6	105.1
Morningstar Credit Segment
Segment Reporting [Line Items]
Consolidated revenue	60.3	64.3	205.9	125.6
Compensation Expense, Excluding Cost of Good and Service Sold	24.8	28.7	49.7	58.9
Segment Reporting, Other Segment Item, Amount	27.6	32.6	55.1	64.5
Morningstar Credit Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	7.9	3.0	13.5	2.2
Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	104.9	85.0	118.3	158.0
Compensation Expense, Excluding Cost of Good and Service Sold	49.9	41.1	94.3	79.6
Segment Reporting, Other Segment Item, Amount	16.5	13.4	31.9	26.5
Morningstar Wealth Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	38.5	30.5	79.7	51.9
Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	37.9	32.4	76.7	65.3
Compensation Expense, Excluding Cost of Good and Service Sold	12.4	11.3	24.4	22.9
Segment Reporting, Other Segment Item, Amount	6.1	5.7	13.1	12.4
Morningstar Retirement Segment \| Operating Segments
Segment Reporting [Line Items]
Reportable Segment Profitability	19.4	15.4	39.2	30.0
License-based
Segment Reporting [Line Items]
Consolidated revenue	455.1	428.4	900.0	846.4
License-based \| Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	413.6	397.5	819.7	782.7
License-based \| Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Consolidated revenue	220.6	207.7	435.8	406.9
License-based \| PitchBook Segment
Segment Reporting [Line Items]
Consolidated revenue	172.7	164.7	343.2	326.5
License-based \| Morningstar Credit Segment
Segment Reporting [Line Items]
Consolidated revenue	13.5	19.7	12.2	38.8
License-based \| Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	6.4	5.0	27.7	9.6
License-based \| Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	0.4	0.4	0.8	0.9
Asset-based
Segment Reporting [Line Items]
Consolidated revenue	96.8	82.4	191.9	168.1
Asset-based \| Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	75.1	67.2	150.0	135.7
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	37.6	35.2	0.0	71.3
Asset-based \| Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	0.0	0.0	74.1	0.0
Asset-based \| Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	37.5	32.0	75.9	64.4
Transaction-based
Segment Reporting [Line Items]
Consolidated revenue	111.3	94.3	216.1	172.5
Transaction-based \| Operating Segments
Segment Reporting [Line Items]
Consolidated revenue	111.2	92.7	215.6	169.1
Transaction-based \| Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Consolidated revenue	1.5	1.5	1.5	1.5
Transaction-based \| PitchBook Segment
Segment Reporting [Line Items]
Consolidated revenue	2.0	1.8	3.9	3.7
Transaction-based \| Morningstar Credit Segment
Segment Reporting [Line Items]
Consolidated revenue	9.2	9.4	193.7	15.5
Transaction-based \| Morningstar Wealth Segment
Segment Reporting [Line Items]
Consolidated revenue	98.5	80.0	16.5	148.4
Transaction-based \| Morningstar Retirement Segment
Segment Reporting [Line Items]
Consolidated revenue	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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