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Summary of Significant Accounting Policies - Schedule of Components of Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Other Intangible Assets    
Amortization period of intangible assets 6 years 3 months 18 days  
Initial Cost $ 1,085.4 $ 1,559.5
Net of Accumulated Amortization 459.3 467.5
Capitalized Contract Costs    
Other Intangible Assets    
Initial Cost 524.4 532.7
Net of Accumulated Amortization 252.8 242.0
Acquired Contracts    
Other Intangible Assets    
Initial Cost 87.4 552.9
Net of Accumulated Amortization 3.0 50.2
Internal Use Software    
Other Intangible Assets    
Initial Cost 387.8 388.7
Net of Accumulated Amortization 155.3 128.8
Acquired Trademarks    
Other Intangible Assets    
Initial Cost 30.2 30.1
Net of Accumulated Amortization 9.6 10.8
Other Intangibles    
Other Intangible Assets    
Initial Cost 17.0 19.4
Projects in Process    
Other Intangible Assets    
Initial Cost 38.6 35.7
Net of Accumulated Amortization $ 38.6 $ 35.7
Weighted Average | Capitalized Contract Costs    
Other Intangible Assets    
Amortization period of intangible assets 5 years 9 months 18 days  
Weighted Average | Acquired Contracts    
Other Intangible Assets    
Amortization period of intangible assets 11 years 8 months 12 days  
Weighted Average | Internal Use Software    
Other Intangible Assets    
Amortization period of intangible assets 4 years 4 months 24 days  
Weighted Average | Acquired Trademarks    
Other Intangible Assets    
Amortization period of intangible assets 25 years 4 months 24 days  
Weighted Average | Other Intangibles    
Other Intangible Assets    
Amortization period of intangible assets 4 years 6 months