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Fair Value Measurements - Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 746.4 | $ 746.2
Junior convertible securities | 313.2 | 312.5
Junior subordinated notes | 271.3 | 0.0
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | 760.6 | 747.5
Junior convertible securities | 436.7 | 391.5
Junior subordinated notes | $ 275.3 | $ 0.0

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