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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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