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Supplemental Financial Data - Future Amortization of Intangibles (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]      
2024 $ 562.0    
2025 520.6    
2026 443.7    
2027 381.6    
2028 324.0    
Thereafter 1,070.3    
Total 3,302.2    
Computer software      
Finite-Lived Intangible Assets [Line Items]      
2024 172.3    
2025 162.6    
2026 117.1    
2027 86.2    
2028 58.7    
Thereafter 69.4    
Total 666.3    
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
2024 205.6    
2025 187.8    
2026 169.9    
2027 152.1    
2028 134.2    
Thereafter 467.1    
Total 1,316.7 $ 1,536.7 $ 1,793.3
Reacquired rights      
Finite-Lived Intangible Assets [Line Items]      
2024 19.4    
2025 19.4    
2026 19.4    
2027 19.4    
2028 19.4    
Thereafter 136.9    
Total 233.9 245.5 284.7
Database      
Finite-Lived Intangible Assets [Line Items]      
2024 148.2    
2025 134.3    
2026 121.0    
2027 107.7    
2028 95.6    
Thereafter 333.8    
Total 940.6 1,100.0 1,285.1
Other intangibles      
Finite-Lived Intangible Assets [Line Items]      
2024 16.5    
2025 16.5    
2026 16.3    
2027 16.2    
2028 16.1    
Thereafter 63.1    
Total $ 144.7 $ 157.9 $ 181.4