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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