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Fair Value Measurements - Other Financial Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 1,098.0	$ 1,097.3
Junior subordinated notes	765.8	565.7
Junior convertible securities	299.5	318.4
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	1,165.6	1,206.6
Junior subordinated notes	809.1	623.1
Junior convertible securities	$ 461.4	$ 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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-Topic 210
-SubTopic 10
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