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Fair Value Measurements - Financial Assets and Liabilities (Details) - Level 2 - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	$ 1,097.5	$ 1,097.3
Junior convertible securities	308.8	318.4
Junior subordinated notes	565.8	565.7
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	1,180.2	1,206.6
Junior convertible securities	459.9	427.6
Junior subordinated notes	$ 593.0	$ 623.1

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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
-Topic 210
-SubTopic 10
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