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Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share, Basic [Abstract]            
Consolidated net income $ 107.8 $ 107.1 $ 89.0 $ 78.5 $ 214.9 $ 167.5
Weighted average common shares outstanding 37.8   42.2   38.5 42.5
Basic net income per share attributable to Morningstar, Inc. $ 2.85   $ 2.11   $ 5.59 $ 3.94
Earnings Per Share, Diluted [Abstract]            
Consolidated net income $ 107.8   $ 89.0   $ 214.9 $ 167.5
Weighted average common shares outstanding 37.8   42.2   38.5 42.5
Net effect of dilutive stock options and restricted stock units 0.3   0.3   0.2 0.3
Weighted average common shares outstanding for computing diluted income per share 38.1   42.5   38.7 42.8
Diluted net income per share attributable to Morningstar, Inc. $ 2.83   $ 2.09   $ 5.55 $ 3.91