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Share-Based Compensation and Employee Ownership Plans Restricted Shares and Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
Mar. 31, 2016
Jan. 31, 2014
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Nonvested Restricted Shares and Restricted Stock Units            
Balance outstanding, beginning of period, shares         253,772  
Weighted-Average Grant Date Fair Value            
Granted, shares       88,504   88,504
Equity Plans | Restricted Shares and Restricted Stock Units (RSUs)            
Nonvested Restricted Shares and Restricted Stock Units            
Balance outstanding, beginning of period, shares         5,962,295 5,579,293
Granted, shares         2,322,996 2,255,794
Vested, shares         (1,545,850) (1,423,075)
Canceled, shares         (584,333) 0
Forfeited, shares         (156,528) (61,997)
Balance outstanding, end of period, shares       6,350,015 5,998,580 6,350,015
Weighted-Average Grant Date Fair Value            
Balance outstanding, beginning of period, in dollars per share         $ 15.73 $ 16.33
Granted, in dollars per share         16.62 14.27
Vested, in dollars per share         16.26 16.08
Canceled, in dollars per share         11.49 0.00
Forfeited, in dollars per share         13.97 14.13
Balance outstanding, end of period, in dollars per share       $ 15.68 $ 16.40 $ 15.68
Unrecognized compensation expense         $ 70.3  
Weighted-average recognition period for unrecognized compensation expense         2 years 2 months 23 days  
Equity Plans | Performance based restricted stock            
Nonvested Restricted Shares and Restricted Stock Units            
Granted, shares 333,333 700,000 481,438      
Vested, shares         (584,333)  
Forfeited, shares         (130,438)  
Non-employee Director | Equity Plans | Restricted Stock Units (RSUs)            
Nonvested Restricted Shares and Restricted Stock Units            
Balance outstanding, end of period, shares         216,912  
Weighted-Average Grant Date Fair Value            
Granted, shares         0  
Stock Issued During Period, Shares, Issued for Services         120,430  
Maximum            
Nonvested Restricted Shares and Restricted Stock Units            
Percent of RSU's earned         200.00%  
Minimum            
Nonvested Restricted Shares and Restricted Stock Units            
Percent of RSU's earned         0.00%