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Fair Value Measurements - Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Senior notes(1) | [1] | $ 745.8 | $ 745.7
Convertible securities |  | 310.5 | 309.9
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Senior notes(1) |  | 753.4 | 765.2
Convertible securities |  | $ 534.2 | $ 549.8
[1] | The carrying value of the senior notes is reported in Senior debt.

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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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