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Earnings Per Share - Narratives (Details) - Convertible Notes, due 2024 - Convertible Debt - $ / shares | Dec. 31, 2017 | Oct. 31, 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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