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Fair Value Measurements - Financial Liabilities not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 1,097.3	$ 746.8
Junior convertible securities	318.4	315.4
Junior subordinated notes	565.7	290.7
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	1,206.6	797.4
Junior convertible securities	427.6	415.7
Junior subordinated notes	$ 623.1	$ 327.7

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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.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value portion of notes payable.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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