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Stock-Based Compensation Plans - Stock-Based Awards (Details) - USD ($) shares in Millions, $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Stock-Based Compensation Plans |  |
Stock-Based Compensation Plans - Disclosures |  |
Compensation cost | $ 56.9 | $ 53.3
Related income tax benefit | 12.8 | 12.6
Capitalized as part of an asset | $ 0.7 | $ 1.5
2020 Directors Stock Plan, the 2014 Stock Incentive Plan, the 2014 Directors Stock Plan, the Amended and Restated 2010 Stock Incentive Plan, the 2005 Directors Stock Plan, the Stock Incentive Plan or the Directors Stock Plan |  |
Stock-Based Compensation Plans - Disclosures |  |
Number of shares that will be granted | 0.0 |
2021 Stock Incentive Plan |  |
Stock-Based Compensation Plans - Disclosures |  |
Maximum number of new shares of common stock available for grant (in shares) | 20.4 |

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