CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 237.8	$ 193.6	$ 436.9	$ 371.0
Other comprehensive income (loss), net:
Unrealized gain (loss) on AFS securities, net of tax effect of $(6.0), $(0.5), $(25.3), and $14.3, respectively	9.7	1.7	65.4	(43.2)
Unrealized gain on SERP, net of tax effect of $0 for each period presented	0.1	0.0	0.1	0.0
Unrealized (loss) on junior subordinated debt, net of tax effect of $1.3, $0.2, $0.9, and $0.4, respectively	(4.1)	(0.5)	(3.0)	(1.0)
Realized (gain) on sale of AFS securities included in income, net of tax effect of $2.9, $0.6, $3.5, and $0.3, respectively	(8.8)	(1.8)	(10.4)	(1.1)
Net other comprehensive (loss) income	(3.1)	(0.6)	52.1	(45.3)
Comprehensive income attributable to noncontrolling interest	7.4	0.0	7.4	0.0
Comprehensive income attributable to Western Alliance	$ 227.3	$ 193.0	$ 481.6	$ 325.7

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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