Debt - Senior Notes - Amendments (Details) - Unsecured senior notes - USD ($) $ in Millions	Dec. 31, 2019	Oct. 30, 2019	Dec. 31, 2018	Apr. 19, 2018	Apr. 01, 2016
Debt Instrument [Line Items]
Debt instrument, interest rate					6.50%
Interest rate if Form 10-K is filed on or before September 30, 2018				7.50%
Interest rate if Form 10-K has not been filed on or before September 30, 2018				8.50%
Interest rate subsequent to Form 10-K filing				7.50%
Consent fee	$ 0.3	$ 0.3	$ 0.3	$ 0.3