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Stock-Based Compensation (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 20, 2018
May 31, 2017
Feb. 28, 2017
Jan. 31, 2017
May 31, 2016
Feb. 29, 2016
May 31, 2015
Feb. 28, 2015
Feb. 28, 2014
Sep. 30, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 03, 2017
May 02, 2017
Dec. 31, 2014
Stock-based compensation                                
Nonvested shares outstanding (in shares)                           2,600,000    
Shares tendered by employees to pay employee withholding taxes (in shares)                     223,027 184,583 201,553      
Nonvested shares                                
Stock-based compensation                                
Total fair value of shares vested                     $ 22.4 $ 15.6 $ 22.4      
Total unrecognized compensation expense                     $ 18.4          
Expected weighted average period for recognition of expense                     1 year 9 months 29 days          
Nonvested share units                                
Stock-based compensation                                
Nonvested shares outstanding (in shares)                     536,000 493,000 544,000     664,000
Granted (in shares)                     387,000 215,000 129,000      
Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Nonvested shares outstanding (in shares)                     410,000 605,000 890,000     1,472,000
Granted (in shares)                     91,000 181,000 109,000      
2013 Plan                                
Stock-based compensation                                
Shares authorized (in shares)                           7,500,000.0 14,700,000  
Number of share available for future grant (in shares)                     4,900,000          
First Anniversary Of Completion Of Performance Period Vesting | 2013 Plan | Vesting Based On Performance | Nonvested shares                                
Stock-based compensation                                
Vesting period                   1 year            
Certain Senior Management | 2013 Plan | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting period     3 years     3 years   3 years 3 years 4 years            
Certain Senior Management | 2013 Plan | Vesting Based On Performance | Nonvested shares                                
Stock-based compensation                                
Performance period     3 years     3 years   3 years 3 years 3 years            
Certain Senior Management | Vesting period one | 2013 Plan | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)     33.00%     33.00%   33.00% 33.00% 25.00%            
Certain Senior Management | Vesting period two | 2013 Plan | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)     33.00%     33.00%   33.00% 33.00% 25.00%            
Certain Senior Management | Vesting period three | 2013 Plan | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)     33.00%     33.00%   33.00% 33.00% 25.00%            
Certain Senior Management | Vesting period four | 2013 Plan | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)                   25.00%            
Employee | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting period             4 years                  
Employee | Vesting Based On Performance | Nonvested shares                                
Stock-based compensation                                
Performance period             3 years                  
Employee | Vesting period one | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)             25.00%                  
Employee | Vesting period two | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)             25.00%                  
Employee | Vesting period three | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)             25.00%                  
Employee | Vesting period four | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)             25.00%                  
Director | Time-Based Share Awards | Nonvested share units | Maximum                                
Stock-based compensation                                
Vesting period   1 year     1 year   1 year                  
Incentive Program Bonus Award Fiscal Year Performance | Employee | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting period     3 years     3 years   3 years 3 years              
Incentive Program Bonus Award Fiscal Year Performance | Employee | Time-Based Share Awards | Nonvested share units                                
Stock-based compensation                                
Vesting period     3 years 3 years   3 years   3 years 3 years              
Incentive Program Bonus Award Fiscal Year Performance | Employee | Vesting period one | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)     33.00%     33.00%   33.00% 33.00%              
Incentive Program Bonus Award Fiscal Year Performance | Employee | Vesting period one | Time-Based Share Awards | Nonvested share units                                
Stock-based compensation                                
Vesting (as a percent)     33.00% 33.00%   33.00%   33.00% 33.00%              
Incentive Program Bonus Award Fiscal Year Performance | Employee | Vesting period two | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)     33.00%     33.00%   33.00% 33.00%              
Incentive Program Bonus Award Fiscal Year Performance | Employee | Vesting period two | Time-Based Share Awards | Nonvested share units                                
Stock-based compensation                                
Vesting (as a percent)     33.00% 33.00%   33.00%   33.00% 33.00%              
Incentive Program Bonus Award Fiscal Year Performance | Employee | Vesting period three | Time-Based Share Awards | Nonvested shares                                
Stock-based compensation                                
Vesting (as a percent)     33.00%     33.00%   33.00% 33.00%              
Incentive Program Bonus Award Fiscal Year Performance | Employee | Vesting period three | Time-Based Share Awards | Nonvested share units                                
Stock-based compensation                                
Vesting (as a percent)     33.00% 33.00%   33.00%   33.00% 33.00%              
Subsequent event | Certain Senior Management | Nonvested shares                                
Stock-based compensation                                
Granted (in shares) 185,896                              
Subsequent event | Certain Employees | Nonvested share units                                
Stock-based compensation                                
Granted (in shares) 90,283