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Underwriting, Acquisition and Insurance Expenses
 9 Months Ended
Sep. 30, 2018
Underwriting Acquisition And Insurance Expenses [Abstract]  
Underwriting, Acquisition and Insurance Expenses
Underwriting, Acquisition and Insurance Expenses
The components of our underwriting, acquisition and insurance expenses are detailed in the table below. General expenses includes certain costs associated with our holding company.
 
 
For the Three Months Ended
September 30,
 
For the Nine Months Ended
September 30,
(in millions)
 
2018
 
2017
 
2018
 
2017
Commissions
 
$
88.0

 
$
70.8

 
$
212.7

 
$
201.2

General expenses
 
83.2

 
89.7

 
261.6

 
266.4

Premium taxes, boards and bureaus
 
9.8

 
11.8

 
27.2

 
25.9

 
 
181.0

 
172.3

 
501.5

 
493.5

Net deferral of policy acquisition costs
 
(13.0
)
 
(6.2
)
 
(16.5
)
 
(19.1
)
Total underwriting, acquisition and insurance expenses
 
$
168.0

 
$
166.1

 
$
485.0

 
$
474.4