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Stock-Based Compensation Plans - Nonqualified Stock Options, Assumptions and Other Disclosures (Details) - Employee Stock Option - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stock-Based Compensation Plans - Disclosures      
Options granted (in shares) 0.0    
Assumptions used to estimate fair value of stock options granted during period      
Weighted-average expected volatility (as a percent) 0.00% 0.00% 34.20%
Weighted-average expected term 0 years 0 years 7 years
Weighted-average risk-free interest rate (as a percent) 0.00% 0.00% 1.20%
Weighted-average expected dividend yield (as a percent) 0.00% 0.00% 3.82%
Weighted-average estimated fair value of stock options granted (in dollars per share) $ 0 $ 0 $ 15.67
Other nonqualified stock option disclosures      
Unrecognized compensation costs $ 0.1    
Weighted-average service period over which unrecognized compensation costs will be recognized 2 months 12 days    
Cash received from stock options exercised $ 25.0 $ 141.6 $ 42.2
Tax benefits realized for the tax deductions from options exercised $ 5.5 $ 37.7 $ 9.1