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Debt - Senior Notes - Amendments (Details) - Unsecured Senior Notes - USD ($)
$ in Millions
Mar. 31, 2017
Oct. 30, 2019
Dec. 31, 2018
Apr. 19, 2018
Dec. 31, 2017
Apr. 01, 2016
Debt Instrument [Line Items]            
Consent fee $ 0.2   $ 0.3 $ 0.3 $ 0.2  
Legal fees $ 0.1          
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%    
Subsequent Event            
Debt Instrument [Line Items]            
Consent fee   $ 0.3