| Carrying Amount And Estimated Fair Values Of Financial Instruments |
| | | | | | | | | | | | | | | | | At December 31, (in millions) | Carrying Amount 2015 | | Estimated Fair Value 2015 | | Carrying Amount 2014 | | Estimated Fair Value 2014 | | | | | | Predecessor | Current portion of long-term debt-affiliated | $ | — |
| | $ | — |
| | $ | 115.9 |
| | $ | 120.0 |
| Long-term debt-affiliated | 630.9 |
| | 630.9 |
| | 1,472.8 |
| | 1,550.4 |
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