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Transactions with Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2017
Related Party Transactions [Abstract] |
Outstanding Loans to Employees | The outstanding balance of loans to employees are presented in the following table. Such amounts are included in Notes and other receivables and Long-term receivables on our Consolidated Balance Sheets.
| December 31,
($ in millions) | 2017 | 2016
Loans related to co-investments (1) | $ | 11.4 |  | 16.0 |
Advances, travel and other (2) | 178.1 |  | 169.5 |
Total | $ | 189.5 |  | 185.5 |
(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.

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