| 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 | 69.6 | 94.3 | 108.6 | 123.1 | 81.4 | 60.3 | 38.0 | -22.0 |
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| Charges (credits) to reconcile net income to cash flows provided from operations: | | | | | | | | |
| Net realized and change in unrealized investment gains | -23.7 | -36.1 | -37.7 | -51.4 | -6.0 | 32.7 | 35.1 | 14.1 |
| Deferred income tax (benefit) expense | -6.4 | 10.3 | 15.4 | 30.7 | 17.2 | 0.4 | -5.8 | -41.8 |
| Other operating items: | | | | | | | | |
| Net change in loss and LAE reserves | 34.6 | 25.0 | -24.2 | -65.4 | 25.8 | 39.8 | 47.6 | 478.4 |
| Net change in unearned premiums | 38.8 | 9.8 | 14.8 | -22.5 | -59.8 | -21.7 | -28.0 | 0.5 |
| Net change in ceded unearned premium | -22.1 | -16.1 | -14.7 | 6.2 | 8.8 | -17.0 | -11.6 | -27.0 |
| Net change in premiums receivable | -6.5 | 4.5 | -9.3 | 5.8 | 53.3 | 27.7 | 22.5 | 14.9 |
| Net change in reinsurance recoverables on paid and unpaid losses | -14.5 | -11.1 | 14.0 | 51.0 | -15.5 | -7.2 | -19.7 | -122.7 |
| Net change in other assets and liabilities | 12.2 | -24.4 | -34.4 | -6.6 | -25.3 | -28.9 | 16.6 | -32.0 |
| Net cash provided from (used for) operations | 150.8 | 69.5 | 47.3 | 119.6 | 132.1 | 145.1 | 191.9 | 121.8 |
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| Cash flows from investing activities: | | | | | | | | |
| Net maturities, purchases and sales of short-term investments | 59.1 | 27.1 | -42.9 | 24.8 | 43.4 | 74.6 | 133.1 | 117.9 |
| Maturities of fixed maturity investments | 472.6 | 539.0 | 543.5 | 411.5 | 376.1 | 339.6 | 262.4 | 390.6 |
| Sales of fixed maturity investments | 1,238.5 | 1,084.2 | 752.9 | 676.4 | 514.0 | 747.8 | 763.5 | 894.7 |
| Sales of common equity securities | 216.3 | 283.5 | 384.9 | 329.3 | 251.9 | 409.2 | 345.6 | 437.1 |
| Return of capital and distributions of other investments | 18.1 | 21.9 | 11.6 | 19.6 | 19.3 | 39.8 | 40.5 | 72.8 |
| Purchases of fixed maturity investments | -1,904.4 | -1,780.3 | -1,395.9 | -1,205.4 | -1,068.8 | -1,270.3 | -1,333.5 | -1,537.2 |
| Purchases of common equity securities | -156.7 | -186.2 | -260.0 | -200.2 | -184.3 | -372.7 | -323.5 | -417.6 |
| Contributions for other investments | -1.5 | -1.5 | -1.0 | -1.3 | -1.3 | -2.6 | -4.2 | -81.9 |
| Net change in unsettled investment purchases and sales | -8.6 | -2.6 | 29.1 | -38.5 | -7.1 | -36.5 | -23.8 | 13.1 |
| Acquisitions of property and equipment | -4.6 | -2.2 | -2.7 | -2.9 | -11.8 | -12.0 | -11.5 | -12.2 |
| Net cash (used for) provided from investing activities | -71.2 | -17.1 | 19.5 | 13.3 | -68.6 | -26.3 | -94.6 | -75.2 |
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| Cash flows from financing activities: | | | | | | | | |
| Cash dividends paid to common shareholders | -79.4 | -79.3 | -79.2 | -79.4 | -79.6 | -79.8 | -80.0 | -80.0 |
| Repurchases and retirements of common stock | | -1.1 | | | | -13.6 | -3.7 | -1.8 |
| Net cash used for financing activities | -81.2 | -81.6 | -92.4 | -96.1 | -96.8 | -97.9 | -89.1 | -86.6 |
| Net increase (decrease) in cash during period | -1.6 | -29.2 | -25.6 | 36.8 | -33.3 | 20.9 | 8.2 | -90.8 |
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| Cash balance at beginning of period | | | | | | | | |
| Cash balance at end of period | | | | | | | | |