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Fair Value Measurements - Other Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	$ 699.6	$ 1,099.4
Junior subordinated notes	1,216.0	765.9
Junior convertible securities	341.7	341.7
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	655.0	1,049.8
Junior subordinated notes	1,067.3	612.0
Junior convertible securities	$ 344.9	$ 340.9

X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

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- Definition

Fair value portion of notes payable.

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