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Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Net Unrealized Appreciation (Depreciation) on Investments [Member] | Defined Benefit Pension and Postretirement Plans [Member] | Long Duration Insurance Contracts [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), Net of Tax [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2022 |  | $ 0.6 | $ 1,913.1 | $ (641.4) | $ (64.1) | $ 4.0 | $ 2,992.9 |  | $ (1,871.4)
Net income (loss) | $ (72.6) |  |  |  |  |  | (72.6) |  |
Employee and director stock-based awards and other |  |  | 18.3 |  |  |  |  |  |
Net appreciation (depreciation) on available-for-sale securities | (86.1) |  |  | (86.1) |  |  |  |  |
Net amount recognized as net periodic benefit cost |  |  |  |  | 4.7 |  |  |  |
Net change in market risk |  |  |  |  |  | 2.6 |  |  |
Dividends to shareholders |  |  |  |  |  |  | (88.0) |  |
Net shares reissued at cost under employee stock-based compensation plans |  |  |  |  |  |  |  |  | 3.7
Balance at end of period at Sep. 30, 2023 | 2,116.3 |  | 1,931.4 | (727.5) | (59.4) | 6.6 | 2,832.3 | $ (780.3) | (1,867.7)
Balance at beginning of period at Jun. 30, 2023 |  | 0.6 | 1,923.0 | (613.3) | (60.9) | 3.3 | 2,853.0 |  | (1,867.8)
Net income (loss) | 8.6 |  |  |  |  |  | 8.6 |  |
Employee and director stock-based awards and other |  |  | 8.4 |  |  |  |  |  |
Net appreciation (depreciation) on available-for-sale securities | (114.2) |  |  | (114.2) |  |  |  |  |
Net amount recognized as net periodic benefit cost |  |  |  |  | 1.5 |  |  |  |
Net change in market risk |  |  |  |  |  | 3.3 |  |  |
Dividends to shareholders |  |  |  |  |  |  | (29.3) |  |
Net shares reissued at cost under employee stock-based compensation plans |  |  |  |  |  |  |  |  | 0.1
Balance at end of period at Sep. 30, 2023 | 2,116.3 |  | 1,931.4 | (727.5) | (59.4) | 6.6 | 2,832.3 | (780.3) | (1,867.7)
Balance at beginning of period at Dec. 31, 2023 | 2,465.6 | 0.6 | 1,939.2 | (462.8) | (54.8) | 0.4 | 2,909.4 |  | (1,866.4)
Balance at beginning of period at Dec. 31, 2023 | (1,866.4) |  |  |  |  |  |  |  |
Net income (loss) | 258.1 |  |  |  |  |  | 258.1 |  |
Employee and director stock-based awards and other |  |  | 23.7 |  |  |  |  |  |
Net appreciation (depreciation) on available-for-sale securities | 214.9 |  |  | 214.9 |  |  |  |  |
Net amount recognized as net periodic benefit cost |  |  |  |  | 4.1 |  |  |  |
Net change in market risk |  |  |  |  |  | (1.3) |  |  |
Dividends to shareholders |  |  |  |  |  |  | (93.0) |  |
Net shares reissued at cost under employee stock-based compensation plans |  |  |  |  |  |  |  |  | 5.6
Balance at end of period at Sep. 30, 2024 | 2,877.7 |  | 1,962.9 | (247.9) | (50.7) | (0.9) | 3,074.5 | (299.5) | (1,860.8)
Balance at end of period at Sep. 30, 2024 | (1,860.8) |  |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2024 |  | $ 0.6 | 1,951.9 | (490.9) | (52.1) | 2.2 | 3,003.4 |  | (1,862.9)
Net income (loss) | 102.1 |  |  |  |  |  | 102.1 |  |
Employee and director stock-based awards and other |  |  | 11.0 |  |  |  |  |  |
Net appreciation (depreciation) on available-for-sale securities | 243.0 |  |  | 243.0 |  |  |  |  |
Net amount recognized as net periodic benefit cost |  |  |  |  | 1.4 |  |  |  |
Net change in market risk |  |  |  |  |  | (3.1) |  |  |
Dividends to shareholders |  |  |  |  |  |  | (31.0) |  |
Net shares reissued at cost under employee stock-based compensation plans |  |  |  |  |  |  |  |  | 2.1
Balance at end of period at Sep. 30, 2024 | 2,877.7 |  | $ 1,962.9 | $ (247.9) | $ (50.7) | $ (0.9) | $ 3,074.5 | $ (299.5) | $ (1,860.8)
Balance at end of period at Sep. 30, 2024 | $ (1,860.8) |  |  |  |  |  |  |  |

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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
Name: | us-gaap_TreasuryStockValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant