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Stock-Based Compensation Plans - Nonqualified Stock Options, Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
2014 Stock Incentive Plan, Amended and Restated 2010 Stock Incentive Plan and Stock Incentive Plan      
Stock-Based Compensation Plans - Disclosures      
Option expiration period 10 years    
Change in options outstanding      
Options granted (in shares) 0.0 0.0 0.8
Employee Stock Option [Member]      
Change in options outstanding      
Options outstanding at beginning of period (in shares) 3.3    
Options granted (in shares) 0.0    
Options exercised (in shares) 0.5    
Options outstanding at end of period (in shares) 2.8 3.3  
Options vested or expected to vest at end of period (in shares) 2.8    
Options exercisable at end of period (in shares) 2.6    
Options outstanding at beginning of period, Weighted-average exercise price (in dollars per share) $ 54.36    
Options exercised, Weighted-average exercise price (in dollars per share) 48.71    
Options outstanding at end of period, Weighted-average exercise price (in dollars per share) 55.39 $ 54.36  
Options vested or expected to vest at end of period, Weighted-average exercise price (in dollars per share) 55.39    
Options exercisable at end of period, Weighted-average exercise price (in dollars per share) $ 55.08    
Options outstanding at end of period, Intrinsic value $ 65.4    
Options vested or expected to vest at end of period, Intrinsic value 65.4    
Options exercisable at end of period, Intrinsic value 60.6    
Total intrinsic value of options exercised $ 15.2 $ 92.0 $ 23.5