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Goodwill and Core Deposit Intangibles (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Change in Carrying Amount of Goodwill
Goodwill
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
Net carrying value at beginning of period
$
212.8

 
$
204.5

 
$
205.6

 
Acquisitions and measurement period adjustments
231.9

 
8.3

 
(1.1
)
 
Net carrying value at end of period
$
444.7

 
$
212.8

 
$
204.5

 
Schedule of Activity of Identifiable Core Deposit Intangibles
The following table sets forth activity for identifiable core deposit intangibles subject to amortization:
Core deposit intangibles ("CDI")
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
CDI, net, beginning of period
$
9.7

 
$
10.6

 
$
13.3

 
Established through acquisitions
48.0

 
2.5

 
0.7

 
Reductions due to sale of accounts
(3.2
)
 
—

 
—

 
Current period amortization
5.4

 
3.4

 
3.4

 
Total CDI, net, at end of period
$
49.1

 
$
9.7

 
$
10.6

 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table provides estimated future CDI amortization expense:
Years ending December 31,
 
 
2018
$
6.9

 
2019
6.6

 
2020
6.2

 
2021
5.7

 
2022
5.3

 
Thereafter
18.4

 
Total
$
49.1