Goodwill and Intangibles (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill [Line Items]

Schedule of Goodwill [Table Text Block]

	As of March 31,
	2019			2018
Net carrying value at beginning of three month period	$	546.7		$	444.7
Measurement period adjustment to previously recorded goodwill	(0.4		)	0.9
Net carrying value at end of period	$	546.3		$	445.6

Schedule of Finite-Lived Intangible Assets

	As of March 31,
	2019			2018
Gross CDI, beginning of period	$	89.7		$	74.0
Accumulated amortization	(35.1		)	(26.7		)
Net CDI, end of period	$	54.6		$	47.3

Schedule of Future Amortization Expense

The following table provides the estimated future CDI amortization expense:

Years Ending December 31,
2019 remaining	$	6.6
2020	8.1
2021	7.5
2022	6.9
2023	6.3
Thereafter	19.2
Total	$	54.6