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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

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