| In millions, except per share items | Jun-30-17 | Mar-31-17 | Dec-31-16 | Sep-30-16 | Jun-30-16 | Mar-31-16 | Dec-31-15 | Sep-30-15 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Cash flows from operations: | | | | | | | | |
| Net income including noncontrolling interests | 0.3 | 32.6 | 8.4 | 28.3 | 25.0 | 46.9 | 22.9 | -13.4 |
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| Charges (credits) to reconcile net income to cash flows provided from operations: | | | | | | | | |
| Net realized and change in unrealized investment gains | -12.3 | -15.0 | 19.1 | -15.5 | -24.7 | -16.6 | 5.4 | 29.9 |
| Deferred income tax (benefit) expense | -4.2 | 1.6 | -6.9 | 3.1 | 12.5 | 6.7 | 8.4 | -10.4 |
| Other operating items: | | | | | | | | |
| Net change in loss and LAE reserves | 42.4 | 3.2 | 3.6 | -14.6 | 32.8 | -46.0 | -37.6 | 76.6 |
| Net change in unearned premiums | 16.8 | 3.3 | -28.1 | 46.8 | -12.2 | 8.3 | -65.4 | 9.5 |
| Net change in ceded unearned premium | -4.2 | -8.2 | -9.1 | -0.6 | 1.8 | -6.8 | 11.8 | 2.0 |
| Net change in premiums receivable | -19.5 | 2.4 | 34.7 | -24.1 | -8.5 | -11.4 | 49.8 | 23.4 |
| Net change in reinsurance recoverables on paid and unpaid losses | -19.9 | 1.4 | 6.3 | -2.3 | -16.5 | 26.5 | 43.3 | -68.8 |
| Net change in other assets and liabilities | 26.6 | -18.3 | -33.2 | 37.1 | -10.0 | -28.3 | -5.4 | 18.4 |
| Net cash provided from (used for) operations | 87.5 | -1.3 | -6.8 | 71.4 | 6.2 | -23.5 | 65.5 | 83.9 |
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| Cash flows from investing activities: | | | | | | | | |
| Net maturities, purchases and sales of short-term investments | 37.1 | 19.5 | -36.5 | 39.0 | 5.1 | -50.5 | 31.2 | 57.6 |
| Maturities of fixed maturity investments | 53.0 | 105.6 | 197.6 | 116.4 | 119.4 | 110.1 | 65.6 | 81.0 |
| Sales of fixed maturity investments | 192.9 | 493.2 | 328.8 | 223.6 | 38.6 | 161.9 | 252.3 | 61.2 |
| Sales of common equity securities | 4.0 | 1.8 | 106.8 | 103.7 | 71.2 | 103.2 | 51.2 | 26.3 |
| Return of capital and distributions of other investments | 0.2 | 13.3 | 2.0 | 2.6 | 4.0 | 3.0 | 10.0 | 2.3 |
| Purchases of fixed maturity investments | -363.7 | -594.2 | -552.4 | -394.1 | -239.6 | -209.8 | -361.9 | -257.5 |
| Purchases of common equity securities | -4.6 | -1.6 | -105.1 | -45.4 | -34.1 | -75.4 | -45.3 | -29.5 |
| Contributions for other investments | -0.1 | -0.8 | -0.3 | -0.3 | -0.1 | -0.3 | -0.6 | -0.3 |
| Net change in unsettled investment purchases and sales | 8.9 | -4.1 | 22.5 | -35.9 | 14.9 | 27.6 | -45.1 | -4.5 |
| Acquisitions of property and equipment | -3.6 | -0.4 | -0.4 | -0.2 | -1.2 | -0.9 | -0.6 | -9.1 |
| Net cash (used for) provided from investing activities | -75.9 | 32.3 | -37.0 | 9.4 | -21.8 | 68.9 | -43.2 | -72.5 |
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| Cash flows from financing activities: | | | | | | | | |
| Cash dividends paid to common shareholders | -19.9 | -19.9 | -19.8 | -19.8 | -19.8 | -19.8 | -20.0 | -20.0 |
| Repurchases and retirements of common stock | | -1.1 | | | | -11.5 | -1.9 | -0.2 |
| Net cash used for financing activities | -19.9 | -21.0 | -20.1 | -20.2 | -20.3 | -31.8 | -23.8 | -20.9 |
| Net increase (decrease) in cash during period | -8.3 | 10.0 | -63.9 | 60.6 | -35.9 | 13.6 | -1.5 | -9.5 |
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| Cash balance at beginning of period | | | | | | | | |
| Cash balance at end of period | | | | | | | | |