| In millions, except per share items | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Revenues: |
| Casualty reinsurance | 205.2 | 238.4 | 278.7 | 308.5 | |
| Insurance programs and coinsurance | 200.2 | 155.2 | 126.5 | 75.7 | |
| Other specialty reinsurance | 131.9 | 149.7 | 162.7 | 134.9 | |
| Property catastrophe reinsurance | 23.0 | 13.4 | 11.0 | 12.7 | |
| Other | 116.0 | 130.7 | | 75.9 | |
| Total revenues | 676.4 | 687.4 | 575.2 | 607.6 | 704.2 |
| Revenue growth | -1.6% | 19.5% | -5.3% | -13.7% | |
| Loss and loss adjustment expenses | -440.5 | -453.1 | -441.3 | -436.4 | -321.6 |
| Policy acquisition costs | -125.5 | -126.8 | -141.1 | -140.7 | |
| Investment expenses | -16.8 | -29.3 | -28.4 | -17.5 | |
| Other operating expenses | 599.8 | 619.0 | 610.1 | 596.9 | 557.4 |
| General and administrative | 28.3 | 30.8 | 22.3 | 21.2 | 18.0 |
| EBITDA | | | | 12.4 | |
| EBITDA margin | 11.1% | 8.8% | -3.8% | 2.0% | 39.6% |
| Depreciation | | | | 0.2 | |
| EBITA | 75.2 | 60.2 | -22.1 | 12.2 | 278.6 |
| EBITA margin | 11.1% | 8.8% | -3.8% | 2.0% | 39.6% |
| Amortization of intangibles | 0.0 | 0.1 | 0.2 | | |
| EBIT | 75.2 | 60.1 | -22.2 | 12.2 | 278.6 |
| EBIT margin | 11.1% | 8.7% | -3.9% | 2.0% | 39.6% |
| Interest and other income (expense), net | | | -5.4 | 1.4 | -4.9 |
| Interest income, net [+] | -24.7 | -19.8 | 3.6 | 1.4 | -4.9 |
| Interest expense | 11.6 | 5.8 | | | |
| Interest income | -13.0 | -14.0 | | | |
| Other income (expense), net | | | -9.0 | | |
| Pre-tax income | 64.9 | 62.6 | -34.9 | 10.8 | 146.7 |
| Income taxes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Tax rate | 0.0% | 0.0% | | 0.2% | 0.0% |
| Net income | 60.5 | 44.7 | -54.5 | -8.9 | 127.1 |
| Net margin | 8.9% | 6.5% | -9.5% | -1.5% | 18.0% |
| |
| Basic EPS | $3.04 | $2.00 | ($2.40) | ($0.39) | |
| Diluted EPS | $3.04 | $2.00 | ($2.40) | ($0.39) | |
| |
| Shares outstanding (basic) | 19.9 | 22.4 | 22.7 | 22.7 | |
| Shares outstanding (diluted) | 19.9 | 22.4 | 22.7 | 22.7 | |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |