Fair Value Measurements (Derivatives Financial Instruments) (Details) (Foreign Exchange Forward [Member], Net Investment Hedging [Member]) In Millions, unless otherwise specified			3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended					3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended						3 Months Ended		6 Months Ended							3 Months Ended		6 Months Ended
	Jun. 30, 2014 USD ($)		Jun. 30, 2014 Other Comprehensive Income (Loss) [Member] USD ($)		Jun. 30, 2014 Other Comprehensive Income (Loss) [Member] USD ($)		Jun. 30, 2014 Euro Member Countries, Euro USD ($)	Jun. 30, 2014 Euro Member Countries, Euro EUR (€)	Jun. 30, 2014 Euro Member Countries, Euro Other Comprehensive Income (Loss) [Member] USD ($)	Jun. 30, 2014 Euro Member Countries, Euro Other Comprehensive Income (Loss) [Member] USD ($)	Jun. 30, 2014 Euro Member Countries, Euro Minimum [Member]	Jun. 30, 2014 Euro Member Countries, Euro Maximum [Member]	Jun. 30, 2014 United Kingdom, Pounds USD ($)	Jun. 30, 2014 United Kingdom, Pounds GBP (£)	Jun. 30, 2014 United Kingdom, Pounds Other Comprehensive Income (Loss) [Member] USD ($)	Jun. 30, 2014 United Kingdom, Pounds Other Comprehensive Income (Loss) [Member] USD ($)	Jun. 30, 2014 United Kingdom, Pounds Minimum [Member]	Jun. 30, 2014 United Kingdom, Pounds Maximum [Member]	Jun. 30, 2014 Japan, Yen USD ($)	Jun. 30, 2014 Japan, Yen Other Comprehensive Income (Loss) [Member] USD ($)	Jun. 30, 2014 Japan, Yen Minimum [Member]	Jun. 30, 2014 Japan, Yen Maximum [Member]	Jun. 30, 2014 KWE [Member] Euro Member Countries, Euro USD ($)		Jun. 30, 2014 KWE [Member] Euro Member Countries, Euro EUR (€)	Jun. 30, 2014 KWE [Member] Euro Member Countries, Euro Other Comprehensive Income (Loss) [Member] USD ($)		Jun. 30, 2014 KWE [Member] Euro Member Countries, Euro Other Comprehensive Income (Loss) [Member] USD ($)		Jun. 30, 2014 KWE [Member] Euro Member Countries, Euro Minimum [Member]	Jun. 30, 2014 KWE [Member] Euro Member Countries, Euro Maximum [Member]	Jun. 30, 2014 KW Residential, LLC [Member] Japan, Yen USD ($)		Jun. 30, 2014 KW Residential, LLC [Member] Japan, Yen JPY (¥)	Jun. 30, 2014 KW Residential, LLC [Member] Japan, Yen Other Comprehensive Income (Loss) [Member] USD ($)		Jun. 30, 2014 KW Residential, LLC [Member] Japan, Yen Other Comprehensive Income (Loss) [Member] USD ($)
Derivative [Line Items]
Notional Amount								€ 93.5						£ 95.5											€ 130.0									¥ 12,200.0
Exchange Rate											1.2400	1.4471					1.5522	1.6491			91.645	91.69								0.8322	0.8621
Fair Value	(1.1)	[1]					(5.3)						(6.1)										(1.2)	[2]								11.5	[3]
Change in Unrealized Gains (Losses)			(3.6)	[1]	(5.2)	[1]			(0.1)	0.1					(2.3)	(4.1)										(1.2)	[2]	(1.2)	[2]						0	[3]	0	[3]
Gross unrealized losses related to hedges																			$ 0.8	$ 1.6

[1] Hedges are presented gross in the consolidated balance sheet. Hedge assets are included in other assets and hedge liabilities are included in other liabilities.

[2] Hedge is held by KWE on its wholly-owned subsidiaries

[3] Hedge is held by KWR on its wholly-owned subsidiaries