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Stock-Based Compensation Plans - Schedule of Stock Option Activity (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Stock Option Activity  
Outstanding at beginning of period | shares 4.9
Granted | shares 2.6
Exercised | shares (0.6)
Cancelled/forfeited | shares 0.0
Outstanding at end of period | shares 7.0
Options exercisable at end of period | shares 3.6
Weighted-Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 19.11
Granted | $ / shares 18.87
Exercised | $ / shares 19.59
Cancelled/forfeited | $ / shares 21.00
Outstanding at end of period | $ / shares 18.98
Options exercisable at end of period | $ / shares $ 18.48
Stock Options, Additional Disclosures  
Weighted-average remaining contractual term, outstanding at end of period (years) 6 years 10 months 24 days
Weighted-average remaining contractual term, options exercisable at end of period (years) 4 years 6 months
Aggregate intrinsic value, outstanding at end of period | $ $ 2.3
Aggregate intrinsic value, options exercisable at end of period | $ $ 1.9