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Fair Value Measurements - Other Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	$ 1,097.8	$ 1,097.3
Junior subordinated notes	765.8	565.7
Junior convertible securities	301.4	318.4
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	1,180.7	1,206.6
Junior subordinated notes	804.3	623.1
Junior convertible securities	$ 457.7	$ 427.6

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- 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.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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- Definition

Fair value portion of notes payable.

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-Name Accounting Standards Codification
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-SubTopic 10
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