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Segment and Geographical Area Information (Details) (Table 3) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Depreciation	$ 32.7	$ 33.2	$ 65.3	$ 66.0
Stock-based compensation expense			38.1	27.5
Operating Segments
Segment Reporting [Line Items]
Depreciation	22.8	28.4	45.5	56.1
Operating Segments | Morningstar Data and Analytics Segment
Segment Reporting [Line Items]
Depreciation	9.2	11.2	18.7	22.0
Operating Segments | PitchBook Segment
Segment Reporting [Line Items]
Depreciation	8.8	8.1	16.7	15.9
Operating Segments | Morningstar Credit Segment
Segment Reporting [Line Items]
Depreciation	1.2	4.4	2.8	8.9
Operating Segments | Morningstar Wealth Segment
Segment Reporting [Line Items]
Depreciation	1.4	2.0	2.8	4.0
Operating Segments | Morningstar Retirement Segment
Segment Reporting [Line Items]
Depreciation	2.2	2.7	4.5	5.3
Operating Segments | Corporate and Other
Segment Reporting [Line Items]
Depreciation	$ 9.9	$ 4.8	$ 19.8	$ 9.9

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