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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 6 Months Ended
Apr. 30, 2019
Mar. 31, 2016
Jan. 31, 2014
Jun. 30, 2019
Jun. 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         0
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       2,194,230 2,179,443
Vested, shares       (1,282,843) (1,390,392)
Canceled, shares       (233,333) 0
Forfeited, shares       (153,399) (44,556)
Balance outstanding, end of period, shares       6,486,950 6,323,788
Weighted-Average Grant Date Fair Value          
Balance outstanding, beginning of period, in dollars per share       $ 15.73 $ 16.33
Granted, in dollars per share       16.67 14.26
Vested, in dollars per share       16.21 16.11
Canceled, in dollars per share       14.12 0.00
Forfeited, in dollars per share       13.94 13.86
Balance outstanding, end of period, in dollars per share       $ 16.06 $ 15.68
Unrecognized compensation expense       $ 77.1  
Weighted-average recognition period for unrecognized compensation expense       2 years 4 months 18 days  
Equity Plans | Performance based restricted stock          
Nonvested Restricted Shares and Restricted Stock Units          
Granted, shares 333,333 700,000 481,438    
Vested, shares       (233,333)  
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       174,285  
Weighted-Average Grant Date Fair Value          
Granted, shares       0  
Stock Issued During Period, Shares, Issued for Services       79,487  
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%