The estimated fair values for each type of instrument are presented below (in millions): | | | | | | | | | | | | | | | | | | September 30,
2017 | | Level One | | Level Two | | Level Three | Asset Class: | | | | | | | | Mutual fund investments in a non-qualified retirement plan(a) | $ | 2.1 |
| | $ | 2.1 |
| | $ | — |
| | $ | — |
| Total Assets | $ | 2.1 |
| | $ | 2.1 |
| | $ | — |
| | $ | — |
| Liability Class: | |
| | |
| | |
| | |
| Liabilities related to non-qualified retirement plan | $ | (2.1 | ) | | $ | (2.1 | ) | | $ | — |
| | $ | — |
| Derivatives – natural gas instruments, net | (0.8 | ) | | — |
| | (0.8 | ) | | — |
| Derivatives – foreign currency swaps, net | (7.2 | ) | | — |
| | (7.2 | ) | | — |
| Total Liabilities | $ | (10.1 | ) | | $ | (2.1 | ) | | $ | (8.0 | ) | | $ | — |
|
| | (a) | Includes mutual fund investments of approximately 30% in common stock of large-cap U.S. companies, 15% in common stock of small to mid-cap U.S. companies, 5% in international companies, 10% in bond funds, 20% in short-term investments and 20% in blended funds. |
| | | | | | | | | | | | | | | | | | December 31,
2016 | | Level One | | Level Two | | Level Three | Asset Class: | | | | | | | | Mutual fund investments in a non-qualified savings plan(a) | $ | 1.8 |
| | $ | 1.8 |
| | $ | — |
| | $ | — |
| Derivatives – natural gas instruments, net | 0.9 |
| | — |
| | 0.9 |
| | — |
| Trading securities | 1.8 |
| | — |
| | 1.8 |
| | — |
| Total Assets | $ | 4.5 |
| | $ | 1.8 |
| | $ | 2.7 |
| | $ | — |
| Liability Class: | |
| | |
| | |
| | |
| Liabilities related to non-qualified savings plan | $ | (1.8 | ) | | $ | (1.8 | ) | | $ | — |
| | $ | — |
| Derivatives – foreign currency swaps, net | (25.8 | ) | | — |
| | (25.8 | ) | | — |
| Total Liabilities | $ | (27.6 | ) | | $ | (1.8 | ) | | $ | (25.8 | ) | | $ | — |
|
| | (a) | Includes mutual fund investments of approximately 25% in the common stock of large-cap U.S. companies, 10% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 5% in bond funds, 40% in short-term investments and 15% in blended funds. |
|