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Share-Based Compensation Plans - Relative Total Shareholder Return Performance Unit Activity (Details) - RTSR - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of Non-vested Performance- Based Share Units      
Beginning balance (in shares) 290 236  
Granted (in shares) 39 54  
Ending balance (in shares) 329 290 236
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 47.36 $ 53.85  
Granted (in dollars per share) 42.09 40.80 $ 41.20
Ending balance (in dollars per share) $ 41.33 $ 47.36 $ 53.85
Weighted- Average Remaining Term in Years 1 year 2 months 12 days 1 year 4 months 24 days 1 year 2 months 12 days
Aggregate Intrinsic Value $ 10.6 $ 9.2 $ 9.2
Fair value of shares vested in period $ 0.0 $ 0.0 $ 0.5