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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
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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

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