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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended 37 Months Ended 61 Months Ended
Feb. 26, 2021
Jan. 31, 2020
Jan. 31, 2017
May 31, 2015
Sep. 30, 2013
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 31, 2020
Feb. 29, 2020
Dec. 31, 2013
Stock-based compensation                      
Shares tendered by employees to pay employee withholding taxes (in shares)           141,801 208,947 718,726      
Nonvested share units                      
Stock-based compensation                      
Granted (in shares)           350,000 143,000 161,000      
Nonvested shares, share units or DEU                      
Stock-based compensation                      
Total fair value of shares vested           $ 18.5 $ 25.5 $ 75.9      
Nonvested shares or share units outstanding                      
Stock-based compensation                      
Total unrecognized compensation expense           $ 24.2          
Expected weighted average period for recognition of expense           1 year 9 months 18 days          
Time-Based Share Awards | Nonvested shares                      
Stock-based compensation                      
Granted (in shares)           69,000 90,000 73,000      
Certain Senior Management | Nonvested shares | Subsequent Event                      
Stock-based compensation                      
Granted (in shares) 373,552                    
Employee | Time-Based Share Awards | Nonvested share units | Incentive Program Bonus Award Fiscal Year Performance                      
Stock-based compensation                      
Vesting period   3 years 3 years             3 years  
Director | Time-Based Share Awards | Nonvested share units | Maximum                      
Stock-based compensation                      
Vesting period                 1 year    
Certain Employees | Nonvested share units | Subsequent Event                      
Stock-based compensation                      
Granted (in shares) 86,058                    
2013 Plan                      
Stock-based compensation                      
Shares authorized (in shares)                     7,500,000
Number of share available for future grant (in shares)           3,700,000          
2013 Plan | Certain Senior Management | Time-Based Share Awards | Nonvested shares                      
Stock-based compensation                      
Vesting period         4 years         3 years  
2013 Plan | Certain Senior Management | Vesting Based On Performance | Nonvested shares                      
Stock-based compensation                      
Vesting period         3 years            
Performance period                   3 years  
2013 Plan | Employee | Time-Based Share Awards | Nonvested shares                      
Stock-based compensation                      
Vesting period       4 years              
2013 Plan | Employee | Vesting Based On Performance | Nonvested shares                      
Stock-based compensation                      
Vesting period       3 years