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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Non-vested Performance- Based Share Units      
Beginning balance (in shares) 176 142  
Granted (in shares) 69 58  
Vested (in shares) (9) (24)  
Ending balance (in shares) 236 176 142
Weighted-Average Grant Date Fair Value Per Share      
Nonvested shares outstanding (in shares) $ 53.85 $ 65.04 $ 63.02
Granted (in dollars per share) 41.20 67.72 $ 55.61
Vested (in dollars per share) $ 52.52 $ 62.73  
Weighted- Average Remaining Term in Years [1] 1 year 2 months 12 days 1 year 6 months  
Aggregate Intrinsic Value $ 9.2 $ 7.9  
Fair value of shares vested in period $ 0.5 $ 1.5 $ 0.0
[1] * Midpoint used in calculation.