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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2017
Transfers and Servicing [Abstract]  
Schedule of Servicing Assets at Amortized Value
Information with respect to the Company’s mortgage servicing rights follows:
Year Ended December 31,
2017
 
2016
 
2015
Balance at beginning of year
$
18.7

 
$
15.9

 
$
14.4

Acquisitions of mortgage servicing rights
3.5

 
—

 
0.3

Originations of mortgage servicing rights
5.6

 
5.8

 
3.6

Amortization expense
(3.0
)
 
(3.0
)
 
(2.4
)
Balance at end of year
24.8

 
18.7

 
15.9

Less valuation reserve
—

 
(0.2
)
 
(0.2
)
Balance at end of year, net of valuation reserve
$
24.8

 
$
18.5

 
$
15.7

 
 
 
 
 
 
Principal balance of serviced loans underlying mortgage servicing rights
$
3,636.7

 
$
3,127.5

 
$
2,906.2

Mortgage servicing rights as a percentage of serviced loans
0.68
%
 
0.59
%
 
0.54
%