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Convertible Senior Notes - Capped Call (Details) - Capped Call shares in Millions, $ in Millions | Mar. 31, 2018 USD ($) $ / Unit shares
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Derivative [Line Items] |
Derivative amount | $ | $ 37.2
Strike price (in usd per share) | 113.75
Derivative, cap price (in usd per share) | 153.13
Derivative, number of shares covered (in shares) | shares | 3.5

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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- Details
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