Included in other assets were the following: | | | | | | | | | | | | | | September 30, 2016 | | December 31, 2015 | | September 30, 2015 | | ($ in millions) | Investments in non-consolidated affiliates | $ | 26.1 |
| | $ | 25.0 |
| | $ | 24.6 |
| Deferred debt issuance costs | 2.8 |
| | 3.3 |
| | 1.1 |
| Bleach joint venture receivable | — |
| | — |
| | 1.8 |
| Tax-related receivables | 15.8 |
| | 1.5 |
| | 1.5 |
| Interest rate swaps | 2.5 |
| | — |
| | — |
| Supply contracts | 572.8 |
| | 406.5 |
| | — |
| Other | 20.3 |
| | 18.3 |
| | 18.3 |
| Other assets | $ | 640.3 |
| | $ | 454.6 |
| | $ | 47.3 |
|
|