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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 25, 2024 | Jul. 23, 2024 | Feb. 29, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |  |  |  |
Stock repurchased during period, shares |  |  |  | 1,804,180 | 308,454 | 160,224 | 1,804,180 | 468,678
Average cost per share |  |  |  | $ 287.81 | $ 239.55 | $ 242.86 | $ 287.81 | $ 240.68
Average cost of shares |  |  |  | $ 519.3 | $ 73.9 | $ 38.9 | $ 519.3 | $ 112.8
Dividends |  |  |  |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) |  |  |  | $ 1.10 | $ 1.00 |  | $ 2.20 | $ 2.00
Common stock dividend quarterly declared and paid per share (in dollars per share) |  |  |  | $ 1.10 | $ 1.00 |  | $ 2.20 | $ 2.00
Dividends paid |  |  |  | $ 62.5 | $ 58.6 |  | $ 125.7 | $ 117.6
Additional share-based compensation disclosures |  |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  | $ 88.0 |  |  | $ 88.0 |
Weighted average recognition period for unrecognized compensation cost (in years) |  |  |  | 1 year 9 months 18 days |  |  | 1 year 9 months 18 days |
Subsequent event |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |
Value of shares authorized by the Board of Directors to be repurchased under share repurchase plan | $ 1,500.0 |  |  |  |  |  |  |
Share repurchases (in shares) | 637,669 |  |  |  |  |  |  |
Value of shares repurchased | $ 182.0 |  |  |  |  |  |  |
Remaining value of shares authorized by the Board of Directors to be repurchased under share repurchase plan | $ 738.5 |  |  |  |  |  |  |
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |  |  |  |
Average cost per share | $ 285.36 |  |  |  |  |  |  |
Q3 2024 Dividends | Subsequent event |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Common stock dividend quarterly declared and paid per share (in dollars per share) |  | $ 1.10 |  |  |  |  |  |
Dividend date of declaration |  | Jul. 23, 2024 |  |  |  |  |  |
Dividend date payable |  | Aug. 30, 2024 |  |  |  |  |  |
Dividend date of record |  | Aug. 16, 2024 |  |  |  |  |  |
Restricted stock units (RSUs) |  |  |  |  |  |  |  |
Additional share-based compensation disclosures |  |  |  |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |  |  | 3 years | 3 years
Changes |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 100,669 |  |  |  |  |
Restricted stock units (RSUs) and performance stock units (PSUs) |  |  |  |  |  |  |  |
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |  |  |  |
Payments to tax authorities on employees' behalf for shares withheld related to share settlements |  |  |  |  |  |  | $ 24.1 | $ 37.3
Dividends |  |  |  |  |  |  |  |
Dividend equivalents paid |  |  |  |  |  |  | $ 2.2 | $ 3.0
Changes |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in units) | 575,418 | 575,418 |  |  |  |  | 437,239 |
Granted (in shares) |  |  |  |  |  |  | 170,611 |
Vested (in units) |  |  |  |  |  |  | (5,194) |
Cancelled or forfeited (in units) |  |  |  |  |  |  | (27,238) |
Unvested at the end of the period (in units) |  |  |  | 575,418 |  |  | 575,418 |
Shares reserved for future grants (all plans) |  |  |  | 1,332,023 |  |  | 1,332,023 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per unit) | $ 235.02 | $ 235.02 |  |  |  |  | $ 213.06 |
Granted (in dollars per unit) |  |  |  |  |  |  | 289.07 |
Vested (in dollars per unit) |  |  |  |  |  |  | 208.03 |
Cancelled or forfeited (in dollars per unit) |  |  |  |  |  |  | 226.17 |
Unvested at the end of the period (in dollars per unit) |  |  |  | $ 235.02 |  |  | $ 235.02 |
Performance stock units (PSUs) |  |  |  |  |  |  |  |
Additional share-based compensation disclosures |  |  |  |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |  |  | 3 years | 3 years
Return on assets result period |  |  | 3 years |  |  |  | 3 years | 3 years
Changes |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 69,942 |  |  |  |  |
Performance stock units (PSUs) | Maximum |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Share of Common Stock |  |  | 2 |  |  |  | 2 | 2

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