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Debt - Quarterly Dividends (Details) - 2017 Convertible Bonds - Convertible Debt |  | 3 Months Ended
--- | --- | ---
Feb. 17, 2017 $ / shares | Mar. 31, 2019 $ / shares
Debt Instrument [Line Items] |  |
Distribution (in dollars per share) |  | $ 0.150
Debt instrument conversion ratio | 0.0265308 | 26.993
Debt Instrument, Convertible, Conversion Price | $ 37.69 | $ 37.05

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