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Intangible Assets Table (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 1,117.7   $ 1,117.7   $ 1,117.7
Finite-Lived Intangible Assets, Accumulated Amortization (625.9)   (625.9)   (584.9)
Net Carrying Amount 491.8   491.8   532.8
Amortization of intangible assets 20.6 $ 21.4 41.3 $ 42.8  
Minimum [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Amortization Expense, Current Fiscal Year 80.0   80.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 80.0   80.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 80.0   80.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 80.0   80.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 80.0   80.0    
Maximum [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Amortization Expense, Current Fiscal Year 85.0   85.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 85.0   85.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 85.0   85.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 85.0   85.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 85.0   85.0    
Capitalized Computer Software, Intangible Asset [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 54.5   54.5   54.2
Finite-Lived Intangible Assets, Accumulated Amortization (50.8)   (50.8)   (49.2)
Net Carrying Amount 3.7   3.7   5.0
Customer Platforms - Intangible Assets [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 856.2   856.2   856.2
Finite-Lived Intangible Assets, Accumulated Amortization (459.9)   (459.9)   (428.2)
Net Carrying Amount 396.3   396.3   428.0
Customer Relationships - Intangible Assets [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 53.0   53.0   53.0
Finite-Lived Intangible Assets, Accumulated Amortization (24.8)   (24.8)   (23.1)
Net Carrying Amount 28.2   28.2   29.9
Technology-Based Intangible Assets [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 154.0   154.0   154.3
Finite-Lived Intangible Assets, Accumulated Amortization (90.4)   (90.4)   (84.4)
Net Carrying Amount $ 63.6   $ 63.6   $ 69.9