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Fair Value Measurements - Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	$ 746.5	$ 746.2
Junior convertible securities	313.9	312.5
Junior subordinated notes	290.7	0.0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	783.8	747.5
Junior convertible securities	416.3	391.5
Junior subordinated notes	$ 307.2	$ 0.0

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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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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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