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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Net Deferred Acquisition Costs The following table sets forth net deferred acquisition costs for the years ended December 31, 2017, 2016 and 2015:
($ millions)
 
2017
 
2016
 
2015
Balance, beginning of year
 
$
129.8

 
$
129.1

 
$
126.5

Acquisition costs deferred
 
245.7

 
291.0

 
285.6

Acquisition costs amortized to expense
 
(257.7
)
 
(290.3
)
 
(283.0
)
Balance, end of year
 
$
117.8

 
$
129.8

 
$
129.1