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Fair Value Measurements - Summary of Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 945.3 | $ 945.1
Convertible securities | 308.0 | 307.5
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | 962.2 | 936.0
Convertible securities | $ 489.5 | $ 466.9

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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