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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	$ 7,015.3	$ 7,157.5
Estimated fair value of debt securities, Unrealized loss position	4,176.5	$ 5,879.6
Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	120.3
Estimated fair value of debt securities, Unrealized loss position	29.9
Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	38.2
Estimated fair value of debt securities, Unrealized loss position	22.5
Non-Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	200.5
Estimated fair value of debt securities, Unrealized loss position	53.0
Non-Investment Grade | Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	111.5
Estimated fair value of debt securities, Unrealized loss position	29.7
Non-Investment Grade | High Yield Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	79.7
Estimated fair value of debt securities, Unrealized loss position	19.6
Non-Investment Grade | Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	7.6
Estimated fair value of debt securities, Unrealized loss position	$ 3.4

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