Long-term Incentive Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			12 Months Ended
	Dec. 30, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				5,847,532
Weighted average grant date fair value (in dollars per share)				$ 40.04
Grant date fair value of vested shares				$ 196.3	$ 244.4	$ 235.8
Number of unvested restricted AB Holding Units (in shares)		12,419,251		12,224,190	12,419,251
Number of restricted AB Units without a service requirement (in shares)				9,102,534
Number of restricted AB Units with a service requirement (in shares)				3,121,656
Director | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation charge				$ 1.0	$ 1.0	$ 1.0
Granted (in shares)				25,518	29,952	30,102
Weighted average grant date fair value (in dollars per share)				$ 39.98	$ 34.06	$ 33.89
Minimum | Director | 2017 Grant 1 | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive awards vesting periods				3 years
Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement with individual, fair value of shares issued				$ 198.6	$ 184.3	$ 170.2
Long-term incentive compensation charge				216.0	$ 208.0	$ 183.0
Unrecognized compensation cost				$ 98.3
Period of recognition (in years)				4 years 7 months 9 days
Incentive Compensation Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	4,200,000	4,400,000	5,000,000.0	4,700,000	4,700,000	5,200,000
Additional AB restricted units granted (in shares)					500,000	300,000	200,000
Incentive Compensation Plan | Minimum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)					$ 36.19	$ 30.56	$ 30.56
Incentive Compensation Plan | Maximum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)					$ 41.11	$ 36.19	$ 38.84
2017 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of awards authorized for issuance (in shares)				60,000,000
Number of newly-issued units (in shares)				30,000,000
Granted AB holding unit net of forfeitures (in shares)		35,854,070		39,202,309	35,854,070
AB Holding units available for future grant (in shares)		24,145,930		20,797,691	24,145,930
Long Term Incentive Plan | Employee | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive awards vesting periods				3 years
Long Term Incentive Plan | Employee | Restricted Stock Units (RSUs) | 33.3% of Options and 25% of Restricted AB Holding Units, Second Anniversary Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage for the term of award				33.30%
Long Term Incentive Plan | Employee | Restricted Stock Units (RSUs) | 33.3% of Options and 25% of Restricted AB Holding Units, First Anniversary Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage for the term of award				33.30%
Long Term Incentive Plan | Employee | Restricted Stock Units (RSUs) | 33.3% of Options and 25% of Restricted AB Holding Units, Third Anniversary Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage for the term of award				33.30%
Employment and Separation Agreements | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation charge				$ 19.2	$ 17.6	$ 30.1
Granted (in shares)				1,100,000	1,200,000	500,000
Employment and Separation Agreements | Minimum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive awards vesting periods				2 years
Weighted average grant date fair value (in dollars per share)				$ 35.90	$ 28.46	$ 27.86
Employment and Separation Agreements | Maximum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive awards vesting periods				10 years
Weighted average grant date fair value (in dollars per share)				$ 42.13	$ 37.26	$ 38.58