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Goodwill and Intangibles (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill [Line Items] |
Schedule of Goodwill [Table Text Block] |
|  | As of September 30,
|  | 2018 |  | 2017
Net carrying value at beginning of nine month period |  | $ | 444.7 |  |  | $ | 212.8 |
Addition to provisional goodwill from acquisition |  | 100.8 |  |  | 232.2 |
Measurement period adjustment to previously recorded goodwill |  | 0.9 |  |  | — |
Net carrying value at end of period |  | $ | 546.4 |  |  | $ | 445.0 |
Schedule of Finite-Lived Intangible Assets |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
CDI, net, beginning of period |  | $ | 45.6 |  |  | $ | 52.8 |  |  | $ | 49.1 |  |  | $ | 9.6 |
Established through acquisitions or provisional adjustments |  | 15.7 |  |  | — |  |  | 15.7 |  |  | 48.0 |
Reductions due to sale of accounts |  | — |  |  | — |  |  | — |  |  | (3.1 | )
CDI current period amortization |  | (2.0 | ) |  | (1.9 | ) |  | (5.5 | ) |  | (3.6 | )
Total CDI, net, end of period |  | $ | 59.3 |  |  | $ | 50.9 |  |  | $ | 59.3 |  |  | $ | 50.9 |
Schedule of Future Amortization Expense | The following table provides the estimated future CDI amortization expense:
Years Ending December 31, |  |  |
2018 remaining |  |  | $ | 2.4 |
2019 |  |  | 8.9 |
2020 |  |  | 8.1 |
2021 |  |  | 7.5 |
2022 |  |  | 6.9 |
Thereafter |  |  | 25.5 |
Total |  |  | $ | 59.3 |

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