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Stock-Based Compensation - Stock Option Activity (Details)
shares in Millions
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
Options, Number of shares  
Options outstanding, beginning (shares) | shares 1.4
Options exercised (shares) | shares 0.0
Options canceled or expired (shares) | shares (0.1)
Options outstanding, ending (shares) | shares 1.3
Options exercisable at end of period (shares) | shares 0.9
Options, Weighted average exercise price  
Options outstanding, beginning (dollars per share) | $ / shares $ 20.36
Options exercised (dollars per share) | $ / shares 23.98
Options canceled or expired (dollars per share) | $ / shares 24.24
Options outstanding, ending (dollars per share) | $ / shares 20.17
Options exercisable at end of period (dollars per share) | $ / shares $ 22.99