Equity - Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 18 Months Ended
Sep. 30, 2019
Aug. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Mar. 22, 2018
Number of shares acquired         1,392,425  
Average cost of acquired shares (in dollars per share)         $ 11.81  
Cost of acquired shares         $ 16.4  
Remaining authorized amount for share repurchase program $ 13.6   $ 13.6 $ 13.6 $ 13.6  
Dividends declared per share of common stock   $ 0.05 $ 0.05 $ 0.05    
Dividends paid (in dollars per share) $ 0.05   $ 0.05      
Dividends paid $ 3.4          
Special dividends paid $ 0.5          
Class A            
Authorized amount for share repurchase program   $ 15.0       $ 15.0