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Summary of Significant Accounting Policies - Schedule of Components of Other Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Other Intangible Assets    
Amortization period of intangible assets 6 years 2 months 12 days  
Initial Cost $ 1,066.1 $ 1,085.4
Net of Accumulated Amortization 380.2 459.3
Capitalized Contract Costs    
Other Intangible Assets    
Initial Cost 469.7 524.4
Net of Accumulated Amortization 166.4 252.8
Acquired Contracts    
Other Intangible Assets    
Initial Cost 66.6 87.4
Net of Accumulated Amortization 0.3 3.0
Internal Use Software    
Other Intangible Assets    
Initial Cost 443.6 387.8
Net of Accumulated Amortization 166.0 155.3
Acquired Trademarks    
Other Intangible Assets    
Initial Cost 30.1 30.2
Net of Accumulated Amortization 8.4 9.6
Other Intangibles    
Other Intangible Assets    
Initial Cost 17.4 17.0
Net of Accumulated Amortization 0.4  
Projects in Process    
Other Intangible Assets    
Initial Cost 38.7 38.6
Net of Accumulated Amortization $ 38.7 $ 38.6
Weighted Average | Capitalized Contract Costs    
Other Intangible Assets    
Amortization period of intangible assets 5 years 10 months 24 days  
Weighted Average | Acquired Contracts    
Other Intangible Assets    
Amortization period of intangible assets 11 years 9 months 18 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 4 months 24 days