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Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Share-based compensation expense           $ 4.0 $ 7.2
ParentCo              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Closing stock price (in dollars per share) $ 42.98 $ 43.10 $ 60.25 $ 44.20      
Key Employees | Restricted Stock Equivalents | ParentCo              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
RSE awards granted, shares 120 134 73 100      
Vesting period, years 4 years     4 years      
Key Employees | Performance Shares              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Maximum award payout (in shares) 544 612 380        
Key Executives | Restricted Stock Equivalents | ParentCo              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
RSE awards granted, shares 71 81 55        
Key Employees and Key Executives | Performance Shares              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
RSE awards granted, shares 272 306 190        
Vesting period, years     3 years 3 years 3 years