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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
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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

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