Consolidated Statement of Equity - USD ($) $ in Millions	Total	Foreign Exchange Contract [Member]	Interest Rate Swap [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income Loss [Member]	Accumulated Other Comprehensive Income Loss [Member] Foreign Exchange Contract [Member]	Accumulated Other Comprehensive Income Loss [Member] Interest Rate Swap [Member]	Noncontrolling Interests [Member]
Beginning balance outstanding (in shares) at Dec. 31, 2018				0	143,205,394
Balance beginning of period at Dec. 31, 2018	$ 1,431.2			$ 0.0	$ 0.0	$ 1,744.6	$ (56.4)	$ (441.5)			$ 184.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock grants (RSG) (in shares)					31,875
Shares retired due to RSG vesting (in shares)					(250,287)
Shares retired due to RSG vesting	(5.1)					(5.1)
Shares retired due to common stock repurchase program (in shares)					(152,252)
Shares retired due to common stock repurchase program	(2.8)				$ (2.8)	(2.7)	(0.1)
Stock based compensation	10.4					10.4
Other comprehensive (loss) income:
Unrealized foreign currency translation loss, net of tax	(18.3)							(16.0)			(2.3)
Unrealized currency derivative contracts gain (loss)		$ 32.9							$ 32.9
Common stock dividends	(30.3)						(30.3)
Preferred stock dividends	0.0
Net income	1.6						(5.3)				6.9
Contributions from noncontrolling interests	5.3										5.3
Distributions to noncontrolling interests	(122.7)										(122.7)
Ending balance outstanding (in shares) at Mar. 31, 2019				0	142,834,730
Balance end of period at Mar. 31, 2019	1,302.2			$ 0.0	$ 0.0	1,747.2	(92.1)	(424.6)			71.7
Beginning balance outstanding (in shares) at Dec. 31, 2019				300,000	142,283,109
Balance beginning of period at Dec. 31, 2019	1,719.2			$ 295.2	$ 0.0	1,754.5	46.2	(417.2)			40.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock grants (RSG) (in shares)					2,533,967
Shares retired due to RSG vesting (in shares)					(409,716)
Shares retired due to RSG vesting	(9.1)					(9.1)
Shares retired due to common stock repurchase program (in shares)					(858,496)
Shares retired due to common stock repurchase program					$ (16.6)	(15.3)	(1.3)
Stock based compensation	8.6					8.6
Other comprehensive (loss) income:
Unrealized foreign currency translation loss, net of tax	(16.5)							(15.0)			(1.5)
Unrealized currency derivative contracts gain (loss)		$ 13.0	$ (5.6)						$ 13.0	$ (5.6)
Common stock dividends	(31.6)						(31.6)
Preferred stock dividends	(4.3)						(4.3)
Net income	(5.9)						(5.6)				(0.3)
Contributions from noncontrolling interests	0.3										0.3
Distributions to noncontrolling interests	(0.2)										(0.2)
KW Europe Fund II deconsolidation	3.7										3.7
Ending balance outstanding (in shares) at Mar. 31, 2020				300,000	143,548,864
Balance end of period at Mar. 31, 2020	$ 1,655.0			$ 295.2	$ 0.0	$ 1,738.7	$ 3.4	$ (424.8)			$ 42.5