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