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Senior Notes (Details) - Senior Notes
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Senior Notes, Gross $ 300.0
Stated interest rate on convertible note 6.875%
Senior Notes maturity date Jul. 15, 2026
Initial debt discount $ 2.3
Proceeds from issuance of debt 296.2
Debt offering commissions and offering costs $ 1.5