Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended							9 Months Ended
	Oct. 22, 2024 USD ($) $ / shares shares	Feb. 29, 2024 shares	Sep. 30, 2024 USD ($) item $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Mar. 31, 2024 $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 $ / shares	Sep. 30, 2024 USD ($) item $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares
Common Stock and Additional Paid-In (in Shares)
Stock repurchased during period, shares			1,535,266	1,804,180		467,213	308,454	160,224		3,339,446	935,891
Average cost per share | $ / shares			$ 281.37	$ 287.81		$ 270.49	$ 239.55	$ 242.86		$ 284.85	$ 255.56
Average cost of shares | $			$ 432.0	$ 519.3		$ 126.4	$ 73.9	$ 38.9		$ 951.3	$ 239.2
Dividends
Number of consecutive years of quarterly cash dividends paid | item			65
Common stock quarterly dividend per share (in dollars per share) | $ / shares			$ 1.10		$ 1.10	$ 1.00		$ 1.00	$ 0.875	$ 3.30	$ 3.00
Votes per share of common stock | item			1							1
Additional share-based compensation disclosures
Total unrecognized compensation cost | $			$ 72.9							$ 72.9
Weighted average recognition period for unrecognized compensation cost (in years)			1 year 8 months 12 days							1 year 8 months 12 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
Q4 2024 Dividends | Subsequent event
Dividends
Common stock dividend quarterly declared and paid per share (in dollars per share) | $ / shares	$ 1.10
Dividend date of declaration	Oct. 22, 2024
Dividend date payable	Dec. 06, 2024
Dividend date of record	Nov. 22, 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 | $										$ 29.6	$ 41.3
Changes
Unvested at the beginning of the period (in units)	567,615				437,239					437,239
Granted (in shares)										170,611
Vested (in units)										(6,527)
Cancelled or forfeited (in units)										(33,708)
Unvested at the end of the period (in units)			567,615							567,615
Shares reserved for future grants (all plans)			1,357,738							1,357,738
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per unit) | $ / shares	$ 235.10				$ 213.06					$ 213.06
Granted (in dollars per unit) | $ / shares										289.07
Vested (in dollars per unit) | $ / shares										207.83
Cancelled or forfeited (in dollars per unit) | $ / shares										227.78
Unvested at the end of the period (in dollars per unit) | $ / shares			$ 235.10							$ 235.10
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