Goodwill and Intangibles (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill [Line Items]

Schedule of Goodwill [Table Text Block]

	As of June 30,
	2018		2017
Net carrying value at beginning of period	$	444.7	$	212.8
Addition to provisional goodwill from acquisition	—		231.5
Measurement period adjustment to previously recorded goodwill	0.9		—
Net carrying value at end of period	$	445.6	$	444.3

Schedule of Finite-Lived Intangible Assets

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
CDI, net, beginning of period	$	47.3		$	9.0		$	49.1		$	9.6
Established through acquisitions or provisional adjustments	—			48.0			—			48.0
Reductions due to sale of accounts	—			(3.1		)	—			(3.1		)
CDI current period amortization	(1.7		)	(1.1		)	(3.5		)	(1.7		)
Total CDI, net, end of period	$	45.6		$	52.8		$	45.6		$	52.8

Schedule of Future Amortization Expense

The following table provides the estimated future CDI amortization expense:

Years Ending December 31,
2018 remaining	$	3.4
2019	6.6
2020	6.2
2021	5.8
2022	5.3
Thereafter	18.3
Total	$	45.6