Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Total revenue	$ 218.3	$ 180.4	$ 409.0	$ 348.0
Operating expenses
General and administrative	13.5	10.0	24.9	19.9
Depreciation and amortization	51.5	52.1	107.2	101.8
Total operating expenses	212.5	178.3	401.4	333.7
Income from unconsolidated investments	10.9	10.8	36.9	39.8
Operating income	16.7	12.9	44.5	54.1
Non-operating income (expense)
Gain on sale of real estate	236.8	66.3	264.8	71.7
Acquisition-related expenses	(0.2)	(0.9)	(0.2)	(1.2)
Interest expense	(67.2)	(52.1)	(126.1)	(102.1)
Other income	10.6	4.4	10.1	4.9
Income before provision for income taxes	196.7	30.6	193.1	27.4
Provision for income taxes	(29.4)	(8.8)	(26.8)	(4.6)
Net income	167.3	21.8	166.3	22.8
Net income attributable to the noncontrolling interests	(57.7)	(12.4)	(59.1)	(12.6)
Net income attributable to Kennedy-Wilson Holdings, Inc. common shareholders	$ 109.6	$ 9.4	$ 107.2	$ 10.2
Basic income per share
Income per basic (in dollars per share)	$ 0.77	$ 0.08	$ 0.74	$ 0.09
Weighted average shares outstanding for basic (in shares)	141,483,445	111,723,952	144,696,059	111,945,354
Diluted income per share
Income per diluted (in dollars per share)	$ 0.77	$ 0.08	$ 0.74	$ 0.09
Weighted average shares outstanding for diluted (in shares)	142,707,159	111,723,952	145,872,617	111,945,354
Dividends declared per common share (in dollars per share)	$ 0.19	$ 0.17	$ 0.38	$ 0.34
Rental [Member]
Revenue
Total revenue	$ 134.9	$ 123.8	$ 269.2	$ 248.1
Operating expenses
Cost of goods and services	39.7	36.6	81.3	72.6
Hotel [Member]
Revenue
Total revenue	37.8	29.0	74.1	58.5
Operating expenses
Cost of goods and services	29.4	22.8	60.2	47.2
Sale of Real Estate [Member]
Revenue
Total revenue	32.8	12.8	42.2	13.6
Operating expenses
Cost of goods and services	31.4	9.6	39.8	10.3
Investment Management, Property Services and Research Fees [Member]
Revenue
Total revenue	12.3	10.3	22.4	21.3
Loan Purchases, Loan Originations and Other [Member]
Revenue
Total revenue	0.5	4.5	1.1	6.5
Commission and Marketing [Member]
Operating expenses
Cost of goods and services	2.1	1.7	3.5	3.7
Compensation and Related [Member]
Operating expenses
Cost of goods and services	$ 44.9	$ 45.5	$ 84.5	$ 78.2