Segment and Geographical Area Information (Details) (Table 2) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Reconciliation of Select Segment Information to Consolidated [Line Items]
Revenue	$ 644.8	$ 581.9
Amortization expense	(19.0)	(14.4)
Business Combination, Acquisition and Integration Related Costs	(4.6)	(6.9)
Operating income	155.9	114.1
Nonoperating Income (Expense)	(14.1)	(5.6)
Equity in investments of unconsolidated entities	(0.1)	(2.6)
Income Loss From Continuing Operations Before Income Taxes Domestic And Foreign	141.7	105.9
Unallocated Corporate Expenses	41.8
Operating Segments
Reconciliation of Select Segment Information to Consolidated [Line Items]
Revenue	585.4	530.1
Reportable Segment Profitability	209.2	174.6
Morningstar Data and Analytics Segment \| Operating Segments
Reconciliation of Select Segment Information to Consolidated [Line Items]
Reportable Segment Profitability	91.0	87.1
PitchBook Segment \| Operating Segments
Reconciliation of Select Segment Information to Consolidated [Line Items]
Reportable Segment Profitability	51.6	52.3
Morningstar Credit Segment \| Operating Segments
Reconciliation of Select Segment Information to Consolidated [Line Items]
Reportable Segment Profitability	5.6	(0.8)
Morningstar Wealth Segment \| Operating Segments
Reconciliation of Select Segment Information to Consolidated [Line Items]
Reportable Segment Profitability	41.2	21.4
Morningstar Retirement Segment \| Operating Segments
Reconciliation of Select Segment Information to Consolidated [Line Items]
Reportable Segment Profitability	19.8	14.6
Corporate and Other \| Operating Segments
Reconciliation of Select Segment Information to Consolidated [Line Items]
Revenue	59.4	51.8
Reportable Segment Profitability	(30.6)	(39.2)
Sustainalytics
Reconciliation of Select Segment Information to Consolidated [Line Items]
Revenue	26.6	28.8
Morningstar Indexes [Member]
Reconciliation of Select Segment Information to Consolidated [Line Items]
Revenue	$ 32.8	$ 23.0

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