KW Unsecured Debt - Senior Notes (Details) - Senior Notes	Feb. 11, 2021 USD ($)	Jun. 30, 2023	Aug. 23, 2021 USD ($)	Mar. 15, 2021 USD ($)
Maximum
Debt Instrument [Line Items]
Balance sheet leverage ratio		1.50
Balance sheet leverage at period end		0.98
4.75% Senior Notes Due 2029 and 5% Senior Notes Due 2031
Debt Instrument [Line Items]
Redemption price (as a percent)	100.00%
Redemption amount (as a percent)	40.00%
4.75% Senior Notes Due 2029 and 5% Senior Notes Due 2031 | Maximum
Debt Instrument [Line Items]
Redemption price (as a percent)	101.00%
2029 Notes
Debt Instrument [Line Items]
Debt face value	$ 500,000,000			$ 100,000,000
Interest rate (as a percent)	4.75%
2031 Notes
Debt Instrument [Line Items]
Debt face value	$ 500,000,000			$ 100,000,000
Interest rate (as a percent)	5.00%
2030 Notes
Debt Instrument [Line Items]
Debt face value			$ 600,000,000
Interest rate (as a percent)			4.75%