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Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Investment without a readily determinable fair value	$ 8,500,000	$ 0
Carrying Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	1,097,200,000	746,800,000
Junior convertible securities	317,700,000	315,400,000
Junior subordinated notes	565,700,000	290,700,000
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	1,197,200,000	797,400,000
Junior convertible securities	390,400,000	415,700,000
Junior subordinated notes	$ 607,900,000	$ 327,700,000

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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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Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value portion of notes payable.

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-SubTopic 10
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