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Debt Securities (Composition of Debt Securities Portfolio by Credit Rating Agencies) (Narrative) (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	$ 7,434.0	$ 7,265.9
Estimated fair value of debt securities, Unrealized loss position	5,643.7	$ 6,175.0
Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	140.5
Estimated fair value of debt securities, Unrealized loss position	76.9
Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	34.5
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	209.0
Estimated fair value of debt securities, Unrealized loss position	113.4
Non-Investment Grade | Bank Loans
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	129.8
Estimated fair value of debt securities, Unrealized loss position	75.5
Non-Investment Grade | High Yield Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	69.5
Estimated fair value of debt securities, Unrealized loss position	32.0
Non-Investment Grade | Emerging Market Securities
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Estimated fair value	9.4
Estimated fair value of debt securities, Unrealized loss position	$ 5.6

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