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Segment and Geographical Area Information (Details) (Table 1)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segments
Sep. 30, 2024
USD ($)
Segment Reporting Information [Line Items]        
Consolidated revenue $ 617.4 $ 569.4 $ 1,804.4 $ 1,684.1
Number of Operating Segments | segments     7  
Number of Reportable Segments | segments     5  
Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated revenue 567.5 519.6 $ 1,655.0 1,533.7
Reportable Segment Profitability 194.7 173.2 567.3 502.9
Morningstar Data and Analytics Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 211.1 198.5 619.5 592.1
Compensation Expense, Excluding Cost of Good and Service Sold 60.7 54.1 176.6 161.7
Segment Reporting, Other Segment Item, Amount 56.7 53.0 165.8 160.5
Morningstar Data and Analytics Segment | Operating Segments        
Segment Reporting Information [Line Items]        
Reportable Segment Profitability 93.7 91.4 277.1 269.9
PitchBook Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 169.0 156.6 499.2 455.9
Compensation Expense, Excluding Cost of Good and Service Sold 77.0 70.5 229.4 216.8
Segment Reporting, Other Segment Item, Amount 39.1 35.7 111.8 101.4
PitchBook Segment | Operating Segments        
Segment Reporting Information [Line Items]        
Reportable Segment Profitability 52.9 50.4 158.0 137.7
Morningstar Credit Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 62.1 61.8 249.1 183.4
Compensation Expense, Excluding Cost of Good and Service Sold 27.0 30.1 85.9 93.7
Segment Reporting, Other Segment Item, Amount 32.0 32.4 96.5 98.2
Morningstar Credit Segment | Operating Segments        
Segment Reporting Information [Line Items]        
Reportable Segment Profitability 3.1 (0.7) 5.3 (8.5)
Morningstar Wealth Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 91.1 70.9 187.7 208.8
Compensation Expense, Excluding Cost of Good and Service Sold 48.6 42.8 128.2 115.9
Segment Reporting, Other Segment Item, Amount 14.4 12.9 40.9 37.5
Morningstar Wealth Segment | Operating Segments        
Segment Reporting Information [Line Items]        
Reportable Segment Profitability 28.1 15.2 80.0 55.4
Morningstar Retirement Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 34.2 31.8 99.5 93.5
Compensation Expense, Excluding Cost of Good and Service Sold 11.5 10.9 34.4 32.2
Segment Reporting, Other Segment Item, Amount 5.8 4.0 18.2 12.9
Morningstar Retirement Segment | Operating Segments        
Segment Reporting Information [Line Items]        
Reportable Segment Profitability 16.9 16.9 46.9 48.4
License-based        
Segment Reporting Information [Line Items]        
Consolidated revenue 435.0 408.8 1,281.4 1,210.7
License-based | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated revenue 402.1 378.0 1,184.8 1,115.4
License-based | Morningstar Data and Analytics Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 211.1 198.5 618.0 590.9
License-based | PitchBook Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 166.9 154.7 493.4 450.4
License-based | Morningstar Credit Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 18.3 20.1 15.0 60.5
License-based | Morningstar Wealth Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 5.4 4.3 57.1 12.2
License-based | Morningstar Retirement Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 0.4 0.4 1.3 1.4
Asset-based        
Segment Reporting Information [Line Items]        
Consolidated revenue 84.7 83.8 252.8 245.5
Asset-based | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated revenue 69.0 66.9 204.7 197.0
Asset-based | Morningstar Data and Analytics Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 0.0 0.0 0.0 0.0
Asset-based | PitchBook Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 0.0 0.0 0.0 0.0
Asset-based | Morningstar Credit Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 35.2 35.5 0.0 104.9
Asset-based | Morningstar Wealth Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 0.0 0.0 106.5 0.0
Asset-based | Morningstar Retirement Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 33.8 31.4 98.2 92.1
Transaction-based        
Segment Reporting Information [Line Items]        
Consolidated revenue 97.7 76.8 270.2 227.9
Transaction-based | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated revenue 96.4 74.7 265.5 221.3
Transaction-based | Morningstar Data and Analytics Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 0.0 0.0 1.5 1.2
Transaction-based | PitchBook Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 2.1 1.9 5.8 5.5
Transaction-based | Morningstar Credit Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 8.6 6.2 234.1 18.0
Transaction-based | Morningstar Wealth Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue 85.7 66.6 24.1 196.6
Transaction-based | Morningstar Retirement Segment        
Segment Reporting Information [Line Items]        
Consolidated revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0