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Intangible Assets Table (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 1,113.9   $ 1,113.9   $ 1,113.5
Accumulated Amortization (375.5)   (375.5)   (332.8)
Net Carrying Amount 738.4   738.4   780.7
Amortization of intangible assets 21.4 $ 21.6 42.9 $ 43.4  
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 48.2   48.2   47.6
Accumulated Amortization (36.8)   (36.8)   (33.9)
Net Carrying Amount 11.4   11.4   13.7
Customer Platforms - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 856.2   856.2   856.2
Accumulated Amortization (269.6)   (269.6)   (237.9)
Net Carrying Amount 586.6   586.6   618.3
Customer Relationships - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 53.0   53.0   53.0
Accumulated Amortization (14.5)   (14.5)   (12.8)
Net Carrying Amount 38.5   38.5   40.2
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 156.5   156.5   156.7
Accumulated Amortization (54.6)   (54.6)   (48.2)
Net Carrying Amount $ 101.9   $ 101.9   $ 108.5