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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, 2016 | Dec. 31, 2015
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Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 944.7 | $ 944.6
Convertible securities | 305.8 | 305.2
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | 954.6 | 966.3
Convertible securities | $ 476.1 | $ 483.6

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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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