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Share-Based Compensation and Employee Ownership Plans Restricted Shares and Restricted Stock Units (Details)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 9 Months Ended
Dec. 05, 2016
Mar. 31, 2016
shares
Jan. 31, 2014
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.25      
Equity Plans | Restricted Shares and Restricted Stock Units (RSUs)        
Nonvested Restricted Shares and Restricted Stock Units        
Balance outstanding, beginning of period, shares       5,717,932
Granted, shares       1,977,514
Vested, shares       (1,953,618)
Canceled, shares       0
Forfeited, shares       (97,353)
Balance outstanding, end of period, shares       5,644,475
Weighted-Average Grant Date Fair Value        
Balance outstanding, beginning of period, in dollars per share | $ / shares       $ 16.23
Granted, in dollars per share | $ / shares       15.11
Vested, in dollars per share | $ / shares       14.63
Canceled, in dollars per share | $ / shares       0.00
Forfeited, in dollars per share | $ / shares       14.77
Balance outstanding, end of period, in dollars per share | $ / shares       $ 16.41
Unrecognized compensation expense | $       $ 65.3
Weighted-average recognition period for unrecognized compensation expense       2 years 6 months
Equity Plans | Performance based restricted stock        
Nonvested Restricted Shares and Restricted Stock Units        
Granted, shares   700,000 481,438  
Forfeited, shares       (109,375)
Non-employee Director | Equity Plans | Restricted Stock Units (RSUs)        
Nonvested Restricted Shares and Restricted Stock Units        
Balance outstanding, end of period, shares       191,962
Weighted-Average Grant Date Fair Value        
Granted, shares       56,519
Maximum        
Nonvested Restricted Shares and Restricted Stock Units        
Percent of RSU's earned       150.00%
Minimum        
Nonvested Restricted Shares and Restricted Stock Units        
Percent of RSU's earned       0.00%