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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	$ 8,248.2	$ 7,265.9
Estimated fair value of debt securities, Unrealized loss position	4,695.7	$ 6,175.0
Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	121.6
Estimated fair value of debt securities, Unrealized loss position	32.7
Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	30.4
Estimated fair value of debt securities, Unrealized loss position	11.6
Non-Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	182.3
Estimated fair value of debt securities, Unrealized loss position	44.7
Non-Investment Grade | Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	113.6
Estimated fair value of debt securities, Unrealized loss position	32.5
Non-Investment Grade | High Yield Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	65.4
Estimated fair value of debt securities, Unrealized loss position	11.3
Non-Investment Grade | Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	2.9
Estimated fair value of debt securities, Unrealized loss position	$ 0.6

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