Consolidated Statements of Comprehensive Income (Loss) - 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 (loss)	$ 5.6	$ (48.3)	$ (24.0)	$ (10.6)
Other comprehensive income (loss), net of tax:
Unrealized foreign currency translation gain (loss)	59.7	(2.8)	86.3	(20.3)
Amounts reclassified from AOCI	3.0	0.0	3.0	5.1
Unrealized foreign currency derivative contracts (loss) gain	(37.1)	5.2	(49.0)	15.1
Total other comprehensive income (loss) for the period	25.6	2.4	40.3	(0.1)
Comprehensive income (loss)	31.2	(45.9)	16.3	(10.7)
Comprehensive (income) loss attributable to noncontrolling interests	(2.6)	0.2	(3.1)	0.3
Comprehensive income (loss) attributable to Kennedy-Wilson Holdings, Inc.	$ 28.6	$ (45.7)	$ 13.2	$ (10.4)