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Employee Benefits Restricted Stock Share Rollforward (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock      
Shares      
Nonvested at December 31, 2017 (in shares) 1,725,909    
Granted (in shares) 479,194    
Vested (in shares) 646,171    
Forfeited (in shares) 345,004    
Nonvested at December 31, 2018 (in shares) 1,213,928 1,725,909  
Weighted- Average Grant-Date Fair Value      
Nonvested at December 31, 2017 (in dollars per share) $ 13.03    
Granted (in dollars per share) 16.11 $ 15.55 $ 11.58
Vested (in dollars per share) 12.58    
Forfeited (in dollars per share) 14.09    
Nonvested at December 31, 2018 (in dollars per share) $ 14.12 $ 13.03  
Compensation cost not yet recognized $ 7.7    
Compensation cost not yet recognized period for recognition 2 years 1 month 15 days    
Fair value of shares vested $ 8.1 $ 8.0 $ 5.3
Performance Shares      
Shares      
Nonvested at December 31, 2018 (in shares) 593,941    
Weighted- Average Grant-Date Fair Value      
Potential performance shares, incremental expense $ 8.4    
Shares outstanding 593,941    
Maximum | Performance Shares      
Shares      
Nonvested at December 31, 2018 (in shares) 1,187,882