| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 8-K | 10-K | 10-K | 10-K |
| Revenues | 806.7 | 730.1 | 540.2 | 647.6 |
| Revenues growth | 10.5% | 35.1% | -16.6% | |
| Expenses | | | | |
| Cost of services (exclusive of depreciation and amortization below) | 435.7 | 406.7 | 301.8 | 356.6 |
| Selling, general and administrative | 200.9 | 188.3 | 173.6 | 173.2 |
| Depreciation and amortization | 72.0 | 78.4 | 76.9 | 78.1 |
| Total expenses | 708.6 | 673.3 | 552.4 | 607.8 |
| Operating income | 98.1 | 56.7 | -12.1 | 39.7 |
| Operating margin | 12.2% | 7.8% | -2.2% | 6.1% |
| |
| Other expenses | | | | |
| Interest expense, net | -32.1 | -74.8 | -75.1 | -81.0 |
| Other expense, net | | 0.5 | 0.9 | 1.8 |
| Total other expenses | | 75.3 | 76.0 | 109.3 |
| Income (loss) before income taxes | | -18.6 | -88.1 | -69.5 |
| Income tax expense (benefit) | -79.1 | 2.7 | 3.9 | 0.9 |
| Net income (loss) | 144.6 | -21.3 | -92.1 | -70.5 |
| |
| Net income (loss) per share: | | | | |
| Basic (in dollars per share) | $1.82 | ($0.35) | ($1.61) | ($1.23) |
| Diluted (in dollars per share) | $1.82 | ($0.35) | ($1.61) | ($1.23) |
| |
| Weighted average shares outstanding: | | | | |
| Basic (in shares) | 79.3 | 60.8 | 57.2 | 57.2 |
| Diluted (in shares) | 79.4 | 60.8 | 57.2 | 57.2 |