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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock-Based Compensation Plans |
Stock-Based Compensation Disclosures (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, |
​ |  | 2023 |  | 2022 |  | 2021 |
​ | ​ | (in millions) |
Compensation cost | ​ | $ | 97.7 | ​ | $ | 89.9 | ​ | $ | 95.2 | ​
Related income tax benefit | ​ | ​ | 23.1 | ​ |  | 20.3 | ​ |  | 19.9 | ​
Capitalized as part of an asset | ​ | ​ | 1.1 | ​ |  | 1.3 | ​ |  | 1.4 | ​
Nonqualified Stock Options Fair Value (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, |
Options |  | 2023 |  | 2022 |  | 2021 |
Expected volatility | ​ | ​ | — | % | ​ | — | % | ​ | 34.2 | %
Expected term (in years) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7.0 | ​
Risk-free interest rate | ​ | ​ | — | % | ​ | — | % | ​ | 1.2 | %
Expected dividend yield | ​ | ​ | — | % | ​ | — | % | ​ | 3.82 | %
Weighted average estimated fair value | ​ | $ | — | ​ | $ | — | ​ | $ | 15.67 | ​
Nonqualified Stock Options Status (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ |
​ | ​ | ​ | ​ | average | ​ | ​ | ​ |
​ |  | Number of options |  | exercise price |  | Intrinsic value |
​ | ​ | (in millions) | ​ | ​ | ​ | ​ | (in millions) |
Options outstanding as of January 1, 2023 |  | 3.3 | ​ | $ | 54.36 | ​ | ​ | ​ | ​
Exercised | ​ | 0.5 | ​ | ​ | 48.71 | ​ | ​ | ​ | ​
Options outstanding as of December 31, 2023 | ​ | 2.8 | ​ | $ | 55.39 | ​ | $ | 65.4 | ​
Options vested or expected to vest as of December 31, 2023 | ​ | 2.8 | ​ | $ | 55.39 | ​ | $ | 65.4 | ​
Options exercisable as of December 31, 2023 | ​ | 2.6 | ​ | $ | 55.08 | ​ | $ | 60.6 | ​
Nonqualified Stock Options Remaining Contractual Lives and Range of Exercise Prices (Table) | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- |
​ | ​ | Number of options | ​ | average remaining |
Range of exercise prices |  | outstanding |  | contractual life |
​ | ​ | (in millions) | ​ | ​ |
$27.46 - $48.11 | ​ | 0.2 | ​ | 2.1 | ​
$48.12 - $52.41 | ​ | 0.8 | ​ | 5.1 | ​
$52.42 - $55.89 | ​ | 0.4 | ​ | 5.2 | ​
$55.90 - $62.75 | ​ | 0.7 | ​ | 7.2 | ​
$62.76 - $63.98 | ​ | 0.7 | ​ | 3.9 | ​
$27.46 - $63.98 | ​ | 2.8 | ​ | ​ | ​
Nonvested Performance Share Awards Activity (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted- |
​ | ​ | performance | ​ | average grant-date |
​ |  | share awards |  | fair value |
​ | ​ | (in millions) | ​ | ​ | ​ |
Nonvested performance share awards as of January 1, 2023 |  | 0.8 | ​ | $ | 59.19 | ​
Granted | ​ | 0.3 | ​ | ​ | 91.47 | ​
Vested | ​ | 0.2 | ​ | ​ | 52.65 | ​
Canceled | ​ | 0.1 | ​ | ​ | 65.92 | ​
Nonvested performance share awards as of December 31, 2023 | ​ | 0.8 | ​ | $ | 71.66 | ​
Nonvested Restricted Stock Units Activity (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted- |
​ | ​ | restricted | ​ | average grant-date |
​ |  | stock units |  | fair value |
​ | ​ | (in millions) | ​ | ​ | ​ |
Nonvested restricted stock units as of January 1, 2023 |  | 3.2 | ​ | $ | 60.69 | ​
Granted | ​ | 0.9 | ​ | ​ | 87.71 | ​
Vested | ​ | 1.0 | ​ | ​ | 51.70 | ​
Canceled | ​ | 0.1 | ​ | ​ | 73.13 | ​
Nonvested restricted stock units as of December 31, 2023 | ​ | 3.0 | ​ | $ | 71.83 | ​

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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