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Shareholders' Equity - Share Repurchase and Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 22, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Aug. 02, 2019
Shareholders' Equity            
Aggregate cost of common stock repurchased during the period     $ 0.1      
Remaining authorization amount for repurchase of common stock           $ 200.0
Dividend declared per common share (in dollars per share) $ 0.04 $ 0.04 $ 0.04 $ 0.08 $ 0.08  
Target dividend per annum (in dollars per share)       $ 0.16    
May 2017 Repurchase Program            
Shareholders' Equity            
Common stock repurchased during the period (in shares)     0   0  
May 2019 Repurchase Program            
Shareholders' Equity            
Amount approved for repurchase of common stock   $ 300.0   $ 300.0    
Common stock repurchased during the period (in shares)   2,300,635   2,300,635    
Aggregate cost of common stock repurchased during the period   $ 100.0   $ 100.0