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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule of Net Deferred Acquisition Costs
The following table sets forth net deferred acquisition costs for the years ended December 31, 2015, 2014 and 2013:
($ millions)
 
2015
 
2014
 
2013
Balance, beginning of year
 
$
126.5

 
$
96.8

 
$
91.7

Acquisition costs deferred
 
285.6

 
251.5

 
214.6

Acquisition costs amortized to expense
 
(283.0
)
 
(221.8
)
 
(209.5
)
Balance, end of year
 
$
129.1

 
$
126.5

 
$
96.8