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Intangible Assets Table (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 1,296.2   $ 1,296.2   $ 1,293.4
Accumulated Amortization (233.1)   (233.1)   (182.3)
Net Carrying Amount 1,063.1   1,063.1   1,111.1
Amortization of Intangible Assets 24.9 $ 24.8 49.9 $ 49.7  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 100.0   100.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 100.0   100.0    
Computer Software, Intangible Asset [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 41.0   41.0   38.0
Accumulated Amortization (24.5)   (24.5)   (20.1)
Net Carrying Amount 16.5   16.5   17.9
Customer Platforms - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 952.2   952.2   952.2
Accumulated Amortization (158.7)   (158.7)   (123.5)
Net Carrying Amount 793.5   793.5   828.7
Customer Relationships - Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 147.0   147.0   147.0
Accumulated Amortization (21.3)   (21.3)   (16.5)
Net Carrying Amount 125.7   125.7   130.5
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 156.0   156.0   156.2
Accumulated Amortization (28.6)   (28.6)   (22.2)
Net Carrying Amount $ 127.4   $ 127.4   $ 134.0