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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Statement of Financial Position [Abstract] |  |  |
Amortized cost of fixed maturities | $ 7,358.2 | $ 6,692.7 |
Allowance for credit losses | (7.5) | (3.3) | $ 0.0
Cost of equity securities | 618.7 | 684.1 |
Premium Receivable, Allowance for Credit Loss | 13.6 | 20.9 | $ 22.3
Long-term Debt, Current and Non-current | $ 1,152.1 | $ 1,247.8 |
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |
Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000 |
Common stock, shares outstanding (in shares) | 63,684,628 | 65,436,207 |

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