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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	$ 8,018.9	$ 7,265.9
Estimated fair value of debt securities, Unrealized loss position	4,989.9	$ 6,175.0
Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	137.4
Estimated fair value of debt securities, Unrealized loss position	32.8
Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	33.8
Estimated fair value of debt securities, Unrealized loss position	19.9
Non-Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	214.5
Estimated fair value of debt securities, Unrealized loss position	51.0
Non-Investment Grade | Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	125.3
Estimated fair value of debt securities, Unrealized loss position	32.6
Non-Investment Grade | High Yield Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	80.3
Estimated fair value of debt securities, Unrealized loss position	14.1
Non-Investment Grade | Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	8.6
Estimated fair value of debt securities, Unrealized loss position	$ 4.0

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