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Intangible Assets Table (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 1,119.8   $ 1,119.8   $ 1,123.9
Finite-Lived Intangible Assets, Accumulated Amortization (724.3)   (724.3)   (667.2)
Net Carrying Amount 395.5   395.5   456.7
Amortization of intangible assets 20.4 $ 20.8 61.4 $ 62.1  
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    
Capitalized Computer Software, Intangible Asset [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 61.1   61.1   60.9
Finite-Lived Intangible Assets, Accumulated Amortization (55.0)   (55.0)   (52.6)
Net Carrying Amount 6.1   6.1   8.3
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 (539.1)   (539.1)   (491.6)
Net Carrying Amount 317.1   317.1   364.6
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 (29.1)   (29.1)   (26.5)
Net Carrying Amount 23.9   23.9   26.5
Technology-Based Intangible Assets [Member]          
Indefinite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 149.5   149.5   153.8
Finite-Lived Intangible Assets, Accumulated Amortization (101.1)   (101.1)   (96.5)
Net Carrying Amount $ 48.4   $ 48.4   $ 57.3