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Share-Based Compensation Plan - Performance-Based Equity Awards, Fair Value Assumptions (Details) - Performance-Based Equity Awards - USD ($)
$ in Millions
Feb. 18, 2021
Feb. 12, 2020
Feb. 13, 2019
Feb. 14, 2018
Feb. 15, 2017
Feb. 10, 2016
Dec. 13, 2013
Relative Total Shareholder Return              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of Total Award 100.00% 100.00% 65.00% 65.00% 65.00% 70.00% 50.00%
Grant Date Fair Value by Component $ 6.0 $ 4.9       $ 1.6 $ 4.7
Volatility 56.00% 23.40%       25.00% 29.00%
Interest Rate 0.19% 1.41%       0.71%  
Dividend Yield 0.00% 0.00%       3.00% 2.40%
Relative Total Shareholder Return | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Interest Rate             0.34%
Relative Total Shareholder Return | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Interest Rate             2.25%
Absolute Total Shareholder Return              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of Total Award     35.00% 35.00% 35.00% 15.00% 50.00%
Grant Date Fair Value by Component           $ 0.2 $ 2.9
Volatility           25.00% 29.00%
Interest Rate           0.71%  
Dividend Yield           3.00% 2.40%
Absolute Total Shareholder Return | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Interest Rate             0.34%
Absolute Total Shareholder Return | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Interest Rate             2.25%
EBITDA Comparison              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of Total Award           15.00%  
Grant Date Fair Value by Component           $ 0.4  
Volatility           25.00%  
Interest Rate           0.71%  
Dividend Yield           3.00%  
Relative and Absolute Total Shareholder Return              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant Date Fair Value by Component     $ 4.5 $ 3.5 $ 2.7    
Volatility     26.00% 28.00% 28.00%    
Interest Rate     2.52% 2.37% 1.27%    
Dividend Yield     4.20% 4.70% 5.60%