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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