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Supplemental Financial Data - Future Amortization of Intangibles (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Feb. 07, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]        
2021 $ 531.2      
2022 494.9      
2023 458.7      
2024 404.1      
2025 368.7      
Thereafter 1,711.3      
Total 3,968.9      
Computer Software        
Finite-Lived Intangible Assets [Line Items]        
2021 101.6      
2022 92.5      
2023 83.6      
2024 56.4      
2025 48.4      
Thereafter 50.2      
Total 432.7      
Customer Relationship        
Finite-Lived Intangible Assets [Line Items]        
2021 239.3      
2022 223.3      
2023 207.3      
2024 191.1      
2025 175.0      
Thereafter 876.5      
Total 1,912.5 $ 2,162.1 $ 74.1 $ 75.7
Database        
Finite-Lived Intangible Assets [Line Items]        
2021 190.3      
2022 179.1      
2023 167.8      
2024 156.6      
2025 145.3      
Thereafter 784.6      
Total $ 1,623.7 $ 1,813.5 $ 48.6 $ 50.0