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Intangible Assets Table (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 1,114.4   $ 1,114.4   $ 1,113.5
Accumulated Amortization (396.7)   (396.7)   (332.8)
Net Carrying Amount 717.7   717.7   780.7
Amortization of intangible assets 21.4 $ 21.6 64.3 $ 65.0  
Minimum [Member]          
Finite-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]          
Finite-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    
Computer Software, Intangible Asset [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 48.9   48.9   47.6
Accumulated Amortization (38.2)   (38.2)   (33.9)
Net Carrying Amount 10.7   10.7   13.7
Customer Platforms - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 856.2   856.2   856.2
Accumulated Amortization (285.4)   (285.4)   (237.9)
Net Carrying Amount 570.8   570.8   618.3
Customer Relationships - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 53.0   53.0   53.0
Accumulated Amortization (15.4)   (15.4)   (12.8)
Net Carrying Amount 37.6   37.6   40.2
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 156.3   156.3   156.7
Accumulated Amortization (57.7)   (57.7)   (48.2)
Net Carrying Amount $ 98.6   $ 98.6   $ 108.5