| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues: |
| Regulated Energy | 429.4 | 383.9 | 350.9 | 343.0 | 345.3 | 324.0 | 302.4 | 300.7 |
| Unregulated Energy | 280.8 | 206.9 | 137.3 | 154.2 | 161.9 | 125.7 | 196.5 | 158.6 |
| Intersegment Eliminations | 29.8 | 21.3 | 17.6 | 18.1 | 17.5 | 17.5 | 11.5 | 5.6 |
| Total revenues | 680.7 | 570.0 | 488.2 | 479.6 | 490.3 | 449.6 | 498.9 | 459.2 |
| Revenue growth [+] | 19.4% | 16.7% | 1.8% | -2.2% | 9.0% | -9.9% | 8.6% | -7.9% |
| Regulated Energy | 11.9% | 9.4% | 2.3% | -0.7% | 6.6% | 7.1% | 0.6% | 0.4% |
| Unregulated Energy | 35.7% | 50.6% | -10.9% | -4.8% | 28.8% | -36.0% | 23.9% | -14.1% |
| Intersegment Eliminations | 39.5% | 21.3% | -2.6% | 3.2% | 0.0% | 52.5% | 103.5% | 127.6% |
| Cost of goods sold [+] | 25.6 | 24.2 | 21.9 | 20.0 | 18.3 | 16.8 | 14.7 | 25.4 |
| Maintenance and operations costs | | | | | | | | 11.8 |
| Direct taxes | | | | | | | | 13.6 |
| Gross profit | 655.1 | 545.8 | 466.3 | 459.6 | 472.0 | 432.8 | 484.1 | 433.8 |
| Gross margin | 96.2% | 95.8% | 95.5% | 95.8% | 96.3% | 96.3% | 97.0% | 94.5% |
| Selling, general and administrative [+] | 164.5 | 148.3 | 142.1 | 137.8 | 132.5 | 121.9 | 115.7 | 107.6 |
| Sales and marketing | 164.5 | 148.3 | 142.1 | 137.8 | 132.5 | 121.9 | 115.7 | 107.6 |
| Other operating expenses | 278.7 | 203.7 | 153.4 | 170.1 | 204.4 | 184.9 | 250.4 | 220.0 |
| EBITDA [+] | 211.9 | 193.8 | 170.8 | 152.2 | 135.6 | 126.2 | 118.0 | 106.2 |
| EBITDA growth | 9.4% | 13.4% | 12.3% | 12.2% | 7.5% | 6.9% | 11.1% | 3.5% |
| EBITDA margin | 31.1% | 34.0% | 35.0% | 31.7% | 27.7% | 28.1% | 23.7% | 23.1% |
| Depreciation | 67.5 | 61.4 | 56.9 | 45.1 | 40.4 | 36.6 | 31.8 | 29.6 |
| EBITA | 144.4 | 132.4 | 113.9 | 107.1 | 95.2 | 89.6 | 86.2 | 76.6 |
| EBITA margin | 21.2% | 23.2% | 23.3% | 22.3% | 19.4% | 19.9% | 17.3% | 16.7% |
| Amortization of intangibles | 1.5 | 1.3 | 1.2 | 0.8 | 0.4 | | 0.4 | 0.4 |
| EBIT [+] | 142.9 | 131.1 | 112.7 | 106.3 | 94.8 | 89.6 | 85.9 | 76.3 |
| EBIT growth | 9.0% | 16.3% | 6.1% | 12.1% | 5.9% | 4.4% | 12.6% | -0.1% |
| EBIT margin | 21.0% | 23.0% | 23.1% | 22.2% | 19.3% | 19.9% | 17.2% | 16.6% |
| Non-recurring items [+] | | | | | | -0.1 | -0.1 | -1.5 |
| Asset impairment | | | | | | -0.1 | -0.1 | -1.5 |
| Interest expense | 24.4 | 20.1 | 21.8 | 22.2 | 16.1 | 12.5 | 10.6 | 10.0 |
| Interest expense | 24.4 | 20.1 | 21.8 | 22.2 | 16.1 | 12.5 | 10.6 | 10.0 |
| Other income (expense), net [+] | 5.1 | 1.7 | 3.2 | -1.8 | -0.6 | -2.2 | -2.3 | 0.3 |
| Other | 5.1 | 1.7 | 3.2 | -1.8 | -0.6 | -2.2 | -2.3 | 0.3 |
| Pre-tax income | 123.6 | 112.7 | 94.2 | 82.2 | 78.1 | 75.0 | 73.0 | 68.0 |
| Income taxes | 33.8 | 29.2 | 23.5 | 21.1 | 21.1 | 14.7 | 28.3 | 26.9 |
| Tax rate | 27.4% | 25.9% | 25.0% | 25.7% | 27.0% | 19.6% | 38.8% | 39.5% |
| Earnings from continuing ops | 89.8 | 83.5 | 70.6 | 61.1 | 57.0 | 60.3 | 44.7 | 41.1 |
| Earnings from discontinued ops | | | 0.2 | 5.4 | | | | |
| Net income | 89.8 | 83.5 | 71.5 | 65.2 | 56.6 | 58.1 | 44.7 | 41.1 |
| Net margin | 13.2% | 14.6% | 14.6% | 13.6% | 11.5% | 12.9% | 9.0% | 9.0% |
| |
| Basic EPS [+] | $5.07 | $4.75 | $4.23 | $3.73 | $3.48 | $3.69 | $2.87 | $2.73 |
| Growth | 6.6% | 12.5% | 13.5% | 7.1% | -5.8% | 28.7% | 5.3% | 9.9% |
| Diluted EPS [+] | $5.04 | $4.73 | $4.21 | $3.71 | $3.47 | $3.68 | $2.86 | $2.72 |
| Growth | 6.5% | 12.4% | 13.4% | 7.1% | -5.8% | 28.7% | 5.3% | 9.9% |
| |
| Dividends per share [+] | $2.09 | $1.73 | $1.59 | $1.59 | $1.44 | $1.22 | $1.20 | $1.13 |
| Growth | 20.9% | 8.8% | 0.0% | 10.5% | 17.6% | 1.4% | 6.2% | 6.2% |
| |
| Shares outstanding (basic) [+] | 17.7 | 17.6 | 16.7 | 16.4 | 16.4 | 16.3 | 15.6 | 15.1 |
| Growth | 0.9% | 5.1% | 1.9% | 0.2% | 0.2% | 4.9% | 3.2% | 3.7% |
| Shares outstanding (diluted) [+] | 17.8 | 17.6 | 16.8 | 16.4 | 16.4 | 16.4 | 15.6 | 15.1 |
| Growth | 1.0% | 5.1% | 2.0% | 0.2% | 0.2% | 4.9% | 3.1% | 3.7% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |