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Investments in Unconsolidated Entities (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
JPY (¥)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Cost method investments $ 3.7 $ 3.2      
Total investments in unconsolidated entities 59.6 63.1      
Cost-method investments, other than temporary impairment 0.0 0.0      
Equity method investment, other than temporary impairment 0.0 0.0      
Other Equity Method Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 6.6 10.3      
YCharts [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage         22.00%
Morningstar Japan KK [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 24.0 $ 23.9      
Equity method investment, ownership percentage 30.40% 30.40% 30.40% 30.40%  
Equity method investment, approximate market value $ 95.0 $ 68.4 ¥ 10,319.0 ¥ 7,525.4  
Sustainalytics [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 25.3 $ 25.7      
Equity method investment, ownership percentage 43.40% 44.00% 43.40% 44.00%  
Ellevest [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage         17.00%