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v3.25.4

Reinsurance - Premium Income Data (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reinsurance Disclosures [Abstract] |  |  |
Direct Premium Income | $ 11,064.0 | $ 10,732.1 | $ 10,286.8
Reinsurance Assumed | 54.5 | 69.8 | 80.4
Reinsurance Ceded | (287.5) | (304.5) | (321.2)
Premium Income | 10,831.0 | 10,497.4 | 10,046.0
Policyholder Benefits and Claims Incurred, Direct | 8,343.9 | 8,027.9 | 8,001.8
Policyholder Benefits and Claims Incurred, Assumed | 154.6 | 152.5 | 138.7
Ceded Benefits and Change in Reserves for Future Benefits | (872.3) | (700.2) | (828.6)
Policy Benefits | 7,626.2 | 7,480.2 | 7,311.9
Liability for Future Policy Benefit, Remeasurement Gain (Loss), Direct | 530.0 | (546.8) | (49.2)
Liability for Future Policy Benefit, Remeasurement Gain (Loss), Assumed | (5.4) | 2.2 | (0.1)
Liability for Future Policy Benefit, Remeasurement Gain (Loss), Ceded | (85.5) | (17.7) | (5.5)
Liability for Future Policy Benefit, Remeasurement Gain (Loss) | $ 439.1 | $ (562.3) | $ (54.8)

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