| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 4.28a | 9.16a |
| Restricted cash | 24.73a | 16.02a |
| Accounts receivable, net | 187.76a | 212.26a |
| Inventories | 122.94a | 114.54a |
| Regulatory assets | 39.85a | 29.63a |
| Prepaid expenses and other | 38.61a | 25.4a |
| Total current assets | 418.19a | 407.01a |
| Property, plant, and equipment, net | 6,398.28a | 6,039.8a |
| Goodwill | 357.59a | 357.59a |
| Regulatory assets | 764.41a | 743.95a |
| Other noncurrent assets | 59.06a | 52.31a |
| Total assets | 7,997.52a | 7,600.65a |
| Liabilities and shareholders' equity | — | — |
| Current liabilities | — | — |
| Current maturities of finance leases | 3.6a | 3.34a |
| Current portion of long-term debt | 299.95a | 99.95a |
| Short-term borrowings | 100a | |
| Accounts payable | 111.79a | 124.34a |
| Accrued expenses and other | 254.6a | 246.17a |
| Regulatory liabilities | 32.26a | 61.1a |
| Total current liabilities | 802.2a | 534.9a |
| Long-term finance leases | 1.87a | 5.46a |
| Long-term debt | 2,695.34a | 2,684.64a |
| Deferred income taxes | 663.43a | 600.52a |
| Noncurrent regulatory liabilities | 660.94a | 657.45a |
| Other noncurrent liabilities | 316.04a | 332.37a |
| Total liabilities | 5,139.82a | 4,815.34a |
| Shareholders' equity | — | — |
| Common stock; Preferred stock | 0.65a | 0.65a |
| Treasury stock at cost | -97.39a | -97.93a |
| Paid-in capital | 2,084.13a | 2,078.75a |
| Retained earnings | 877.02a | 811.5a |
| Accumulated other comprehensive loss | -6.7a | -7.66a |
| Total shareholders' equity | 2,857.7a | 2,785.31a |
| Total liabilities and shareholders' equity | 7,997.52a | 7,600.65a |