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Earnings Per Share - Narratives (Details) - Convertible Notes, due 2024 - Convertible Debt - $ / shares | Dec. 31, 2017 | Nov. 06, 2017
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Antidilutive Securities Excluded from Computation of Earnings Per Share |  |
Debt instrument, conversion price (usd per share) |  | $ 58.725
Maximum |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |
Debt instrument, conversion price (usd per share) | $ 71.775 |

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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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