v3.26.1
SEGMENT INFORMATION - Schedule of Segment Profitability and Reconciliation to Net Income (Details) - USD ($)
$ 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
Segment Reporting [Line Items]            
Operating revenues $ 867.0   $ 772.7   $ 1,717.8 $ 1,518.5
Amortization of intangible assets 43.8   43.7   85.7 87.6
Depreciation and amortization of property, equipment and leasehold improvements 6.2   5.4   12.1 10.1
Acquisition-related integration and transaction costs 1.0   0.0   1.0 0.0
Operating income 487.5   425.3   944.4 802.3
Other expense (income), net 70.2   47.5   137.9 93.4
Income before provision for income taxes 417.3   377.8   806.5 708.9
Provision for income taxes 75.3   74.1   58.5 116.6
Net income 342.0 $ 406.0 303.7 $ 288.6 748.0 592.3
Total reportable segment operating revenues            
Segment Reporting [Line Items]            
Operating revenues 792.3   701.5   1,570.5 1,380.0
Adjusted EBITDA expenses 270.9   247.0   558.1 514.1
Adjusted EBITDA 521.4   454.5   1,012.4 865.9
Index            
Segment Reporting [Line Items]            
Operating revenues 511.0   434.9   1,007.3 856.6
Adjusted EBITDA expenses 113.2   104.7   234.3 214.8
Adjusted EBITDA 397.8   330.2   773.0 641.8
Analytics            
Segment Reporting [Line Items]            
Operating revenues 189.4   177.7   379.4 349.9
Adjusted EBITDA expenses 101.4   85.1   208.6 181.3
Adjusted EBITDA 88.0   92.6   170.8 168.6
Sustainability and Climate            
Segment Reporting [Line Items]            
Operating revenues 91.9   88.9   183.8 173.5
Adjusted EBITDA expenses 56.3   57.2   115.2 118.0
Adjusted EBITDA 35.6   31.7   68.6 55.5
All Other - Private Assets            
Segment Reporting [Line Items]            
Operating revenues 74.7   71.2   147.3 138.5
Adjusted EBITDA $ 17.1   $ 19.9   $ 30.8 $ 34.1