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Acquisitions, Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Business Combination [Line Items]    
Goodwill $ 1,745.6  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 1,610.8  
Foreign currency translation and other (5.1)  
Goodwill, Ending Balance 1,745.6  
Operating Segments    
Business Combination [Line Items]    
Goodwill 1,535.9  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 1,540.7  
Foreign currency translation and other (4.8)  
Goodwill, Ending Balance 1,535.9  
Morningstar Data and Analytics Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill 604.2  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 608.6  
Foreign currency translation and other (4.4)  
Goodwill, Ending Balance 604.2  
PitchBook Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill 628.7  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 628.7  
Foreign currency translation and other 0.0  
Goodwill, Ending Balance 628.7  
Morningstar Credit Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill 118.0  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 119.6  
Foreign currency translation and other (1.6)  
Goodwill, Ending Balance 118.0  
Morningstar Wealth Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill 91.5  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 90.3  
Foreign currency translation and other 1.2  
Goodwill, Ending Balance 91.5  
Morningstar Retirement Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill 93.5  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 93.5  
Foreign currency translation and other 0.0  
Goodwill, Ending Balance 93.5  
Corporate and Other | Operating Segments    
Business Combination [Line Items]    
Goodwill 209.7  
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 70.1  
Foreign currency translation and other (0.3)  
Goodwill, Ending Balance 209.7  
DealX    
Business Combination [Line Items]    
Goodwill, Acquired During Period 139.9 $ 9.7
DealX | Operating Segments    
Business Combination [Line Items]    
Goodwill, Acquired During Period 0.0  
DealX | Morningstar Data and Analytics Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill, Acquired During Period 0.0  
DealX | PitchBook Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill, Acquired During Period 0.0  
DealX | Morningstar Credit Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill, Acquired During Period 0.0  
DealX | Morningstar Wealth Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill, Acquired During Period 0.0  
DealX | Morningstar Retirement Segment | Operating Segments    
Business Combination [Line Items]    
Goodwill, Acquired During Period 0.0  
DealX | Corporate and Other | Operating Segments    
Business Combination [Line Items]    
Goodwill, Acquired During Period $ 139.9  
Lumonic    
Business Combination [Line Items]    
Goodwill, Acquired During Period   $ 21.3