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Intangible Assets Table (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 1,112.5   $ 1,112.5   $ 1,111.0
Accumulated Amortization (311.0)   (311.0)   (246.5)
Net Carrying Amount 801.5   801.5   864.5
Amortization of intangible assets 21.6 $ 23.7 65.0 $ 73.6  
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 47.2   47.2   45.8
Accumulated Amortization (32.3)   (32.3)   (27.6)
Net Carrying Amount 14.9   14.9   18.2
Customer Platforms - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 856.2   856.2   856.2
Accumulated Amortization (222.0)   (222.0)   (174.4)
Net Carrying Amount 634.2   634.2   681.8
Customer Relationships - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 53.0   53.0   53.0
Accumulated Amortization (12.0)   (12.0)   (9.4)
Net Carrying Amount 41.0   41.0   43.6
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 156.1   156.1   156.0
Accumulated Amortization (44.7)   (44.7)   (35.1)
Net Carrying Amount $ 111.4   $ 111.4   $ 120.9