Quarterly report pursuant to Section 13 or 15(d)

Common and Preferred Stock Issuance (Details)

v3.8.0.1
Common and Preferred Stock Issuance (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Mar. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]        
Common stock, par value (in dollars per share)     $ 0.166667 $ 0.166667
Preferred dividend percentage     7.25% 7.25%
Preferred stock, par value (in dollars per share)     $ 1.00 $ 1
Preferred stock, liquidation preference per share (in dollars per share)     $ 100  
Issuance of common stock and mandatory convertible preferred stock   $ 72.3    
Convertible preferred stock, terms of conversion, measurement period     20 days  
Preferred stock, dividends per share, declared (in dollars per share) $ 1.8125      
Common Stock        
Class of Stock [Line Items]        
Common stock, shares issued   12,000,000    
Stock issued, price per share (in dollars per share)   $ 2.10    
Common Stock | Minimum        
Class of Stock [Line Items]        
Convertible preferred stock, shares issued upon conversion     41.4079  
Common Stock | Maximum        
Class of Stock [Line Items]        
Convertible preferred stock, shares issued upon conversion     47.6190  
Preferred Stock        
Class of Stock [Line Items]        
Common stock, shares issued   500,000    
Series A Preferred Stock        
Class of Stock [Line Items]        
Preferred dividend percentage     7.25%