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Intangible Assets Table (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 1,111.3   $ 1,111.3   $ 1,111.0
Accumulated Amortization (289.5)   (289.5)   (246.5)
Net Carrying Amount 821.8   821.8   864.5
Amortization of intangible assets 21.6 $ 24.9 43.4 $ 49.9  
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 46.1   46.1   45.8
Accumulated Amortization (30.8)   (30.8)   (27.6)
Net Carrying Amount 15.3   15.3   18.2
Customer Platforms - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 856.2   856.2   856.2
Accumulated Amortization (206.1)   (206.1)   (174.4)
Net Carrying Amount 650.1   650.1   681.8
Customer Relationships - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 53.0   53.0   53.0
Accumulated Amortization (11.1)   (11.1)   (9.4)
Net Carrying Amount 41.9   41.9   43.6
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 156.0   156.0   156.0
Accumulated Amortization (41.5)   (41.5)   (35.1)
Net Carrying Amount $ 114.5   $ 114.5   $ 120.9