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Segment and Geographical Area Information (Details) (Table 2) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue $ 663.2 $ 605.1 $ 1,308.0 $ 1,187.0
Amortization expense (20.9) (15.3) (39.9) (29.7)
Business Combination, Acquisition and Integration Related Costs (1.2) (3.8) (5.8) (10.7)
Operating income 160.6 125.1 316.5 239.2
Nonoperating Income (Expense) (13.6) (8.6) (27.7) (14.2)
Equity in investments of unconsolidated entities (0.9) (1.2) (1.0) (3.8)
Income Loss From Continuing Operations Before Income Taxes Domestic And Foreign 146.1 115.3 287.8 221.2
Unallocated Corporate Expenses 55.6 50.1 97.4 91.9
Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
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 | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 100.3 96.3 191.3 183.4
PitchBook Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 53.0 52.8 104.6 105.1
Morningstar Credit Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 7.9 3.0 13.5 2.2
Morningstar Wealth Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 38.5 30.5 79.7 51.9
Morningstar Retirement Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 19.4 15.4 39.2 30.0
Corporate and Other | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue 63.3 47.7 122.7 99.5
Reportable Segment Profitability (43.2) (54.6) (73.8) (93.8)
Sustainalytics        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue 25.5 27.3 52.1 56.1
Morningstar Indexes [Member]        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue $ 37.8 $ 20.4 $ 70.6 $ 43.4