v3.25.2
Segment and Geographical Area Information (Details) (Table 2) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue $ 605.1 $ 571.9 $ 1,187.0 $ 1,114.7
Amortization expense (15.3) (17.5) (29.7) (35.2)
Business Combination, Acquisition and Integration Related Costs (3.8) (5.0) (10.7) (5.5)
Operating income 125.1 108.5 239.2 201.1
Nonoperating Income (Expense) (8.6) (19.0) (14.2) (24.6)
Equity in investments of unconsolidated entities (1.2) (1.2) (3.8) (2.7)
Income Loss From Continuing Operations Before Income Taxes Domestic And Foreign 115.3 88.3 221.2 173.8
Unallocated Corporate Expenses 50.1 46.1 91.9 87.0
Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue 557.4 522.1 1,087.5 1,014.1
Reportable Segment Profitability 198.0 177.6 372.6 329.7
Morningstar Data and Analytics Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 96.3 87.3 183.4 178.5
PitchBook Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 52.8 47.3 105.1 87.3
Morningstar Credit Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 3.0 (2.2) 2.2 (7.8)
Morningstar Wealth Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 30.5 27.9 51.9 40.2
Morningstar Retirement Segment | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Reportable Segment Profitability 15.4 17.3 30.0 31.5
Corporate and Other | Operating Segments        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue 47.7 49.8 99.5 100.6
Reportable Segment Profitability (54.6) (46.6) (93.8) (87.9)
Sustainalytics        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue 27.3 29.2 56.1 60.0
Morningstar Indexes [Member]        
Reconciliation of Select Segment Information to Consolidated [Line Items]        
Revenue $ 20.4 $ 20.6 $ 43.4 $ 40.6