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Transactions with Affiliates (Tables)
12 Months Ended
Dec. 31, 2016
Related Party Transactions [Abstract]  
Outstanding Loans to Employees
The outstanding balance of loans to employees are presented in the following table.     
 
December 31,
($ in millions)
2016
2015
Loans related to co-investments (1)
$
16.0

13.4

Advances, travel and other (2)
169.5

126.7

Total
$
185.5

140.1


(1) These nonrecourse loans have been made to allow employees the ability to participate in investment fund opportunities.
(2) Consists primarily of commissions and other compensation advances to employees that are amortized to Compensation and benefits based on performance over required service periods.