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Fair Value Measurements - Estimated Fair Values of Convertible Notes (Detail) $ in Millions | Dec. 31, 2016 USD ($)
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Estimated Fair Value Of Financial Instruments [Line Items] |
Estimated fair values of debt instruments | $ 945.6
2012 Notes |
Estimated Fair Value Of Financial Instruments [Line Items] |
Estimated fair values of debt instruments | 494.2
2013 Notes |
Estimated Fair Value Of Financial Instruments [Line Items] |
Estimated fair values of debt instruments | $ 451.4

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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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