INCOME TAXES - Reconciliation of statutory federal income tax rate to effective income tax rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory U.S. federal income tax rate	$ 329.0	$ 227.6	$ 220.0
Impact of federal, state and local tax law and rate changes, net	105.6	48.7	45.2
Foreign tax effects	0.2	1.2	0.0
Effect of changes in tax laws or rates	12.6	1.0	0.0
Effect of cross-border tax laws	(6.9)	(4.9)	(4.7)
Tax credits	(1.1)	(1.0)	(1.6)
Valuation allowances	5.1	4.8	(5.1)
Nontaxable or nondeductible items	7.6	8.1	0.9
Changes in unrecognized tax benefits	21.1	42.4	30.8
Other adjustments	(6.6)	(9.0)	0.7
Total	$ 466.6	$ 318.9	$ 286.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory U.S. federal income tax rate	21.00%	21.00%	21.00%
Impact of federal, state and local tax law and rate changes, net	6.70%	4.50%	4.30%
Foreign tax effects	0.00%	0.10%	0.00%
Effect of changes in tax laws or rates	0.80%	0.10%	0.00%
Effect of cross-border tax laws	(0.40%)	(0.40%)	(0.40%)
Tax credits	(0.10%)	(0.10%)	(0.20%)
Valuation allowances	0.30%	0.40%	(0.50%)
Nontaxable or nondeductible items	0.50%	0.70%	0.10%
Changes in unrecognized tax benefits	1.30%	3.90%	2.90%
Other adjustments	(0.30%)	(0.80%)	0.10%
Effective tax rate	29.80%	29.40%	27.30%