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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 12 Months Ended
Apr. 30, 2019
Mar. 31, 2016
Jan. 31, 2014
Dec. 31, 2019
Dec. 31, 2018
Weighted-Average Grant Date Fair Value          
Granted, shares       0 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       2,435,058 2,413,727
Vested, shares       (2,291,032) (1,961,824)
Canceled, shares       (584,333) 0
Forfeited, shares       (157,502) (68,901)
Balance outstanding, end of period, shares       5,364,486 5,962,295
Weighted-Average Grant Date Fair Value          
Balance outstanding, beginning of period, in dollars per share       $ 15.73 $ 16.33
Granted, in dollars per share       16.58 14.20
Vested, in dollars per share       15.63 15.60
Canceled, in dollars per share       11.49 0
Forfeited, in dollars per share       13.98 14.21
Balance outstanding, end of period, in dollars per share       $ 16.67 $ 15.73
Unrecognized compensation expense       $ 62.6  
Weighted-average recognition period for unrecognized compensation expense       2 years 1 month 9 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, beginning of period, shares       253,772  
Balance outstanding, end of period, shares       216,912 253,772
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%