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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options granted during the period (in shares)	283	373
Fair value per share (in dollars per share)	$ 173.30	$ 129.69
Cash received from exercise of options	$ 104.0	$ 110.6
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted (in shares)	396	273
Weighted-average grant date fair value (in dollars per share)	$ 554.52	$ 437.36
Restricted stock awards vested during period (in shares)	122
Weighted average grant date fair value per share (in dollars per share)	$ 433.13
Weighted average vest date fair value per share (in dollars per share)	$ 555.61
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted (in shares)	136	74
Vesting period	3 years
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		100.00%
Performance/market-based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted (in shares)	72
Vesting period	3 years
Performance/market-based | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	200.00%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of eligible earnings to purchase common stock through the employee stock purchase plan	10.00%
Discount on the average closing price for the employee stock purchase plan	10.00%
Shares of stock purchased during the period by participants in the employee stock purchase plan (in shares)	29	29
Proceeds from issuance of shares under employee stock purchase plan	$ 14.5	$ 11.6

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- Definition

The weighted average fair value as of vest dates pertaining to a share-based award plan other than a stock option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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