Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions		Total	Net effect of adoption of new accounting standard	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Deficit	Retained Deficit Net effect of adoption of new accounting standard	Non-Controlling Interests— Non-Redeemable
Beginning Balance, stockholders' equity (shares) at Dec. 31, 2018				48,869,000
Beginning Balance, stockholders' equity at Dec. 31, 2018		$ 1,098.9	$ 18.0	$ 0.5	$ 673.5	$ (22.4)	$ (247.0)	$ 18.0	$ 694.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(4.1)					(20.1)		16.0
Equity-based compensation (shares)				517,000
Equity-based compensation		0.9			0.9
Preferred dividends		(8.5)			(8.5)
Other comprehensive income (loss)		(11.5)				(11.5)
Acquisition and disposal of shares of non-controlling interests, net	[1]	14.1			8.0				6.1
Distributions to non-controlling interests—non-redeemable holders		(23.5)							(23.5)
Ending Balance, stockholders' equity (shares) at Mar. 31, 2019				49,386,000
Ending Balance, stockholders' equity at Mar. 31, 2019		1,084.3		$ 0.5	673.9	(33.9)	(249.1)		692.9
Beginning Balance, stockholders' equity (shares) at Dec. 31, 2018				48,869,000
Beginning Balance, stockholders' equity at Dec. 31, 2018		1,098.9	$ 18.0	$ 0.5	673.5	(22.4)	(247.0)	$ 18.0	694.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)		(35.1)
Ending Balance, stockholders' equity (shares) at Sep. 30, 2019				49,506,000
Ending Balance, stockholders' equity at Sep. 30, 2019		1,006.5		$ 0.5	670.3	(57.5)	(284.6)		677.8
Beginning Balance, stockholders' equity (shares) at Mar. 31, 2019				49,386,000
Beginning Balance, stockholders' equity at Mar. 31, 2019		1,084.3		$ 0.5	673.9	(33.9)	(249.1)		692.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(1.1)					(19.8)		18.7
Equity-based compensation (shares)				117,000
Equity-based compensation		3.1			3.1
Preferred dividends		(8.8)			(8.8)
Other comprehensive income (loss)		(16.8)				(16.8)
Acquisition and disposal of shares of non-controlling interests, net	[1]	2.0			9.6				(7.6)
Distributions to non-controlling interests—non-redeemable holders		(17.7)							(17.7)
Ending Balance, stockholders' equity (shares) at Jun. 30, 2019				49,503,000
Ending Balance, stockholders' equity at Jun. 30, 2019		1,045.0		$ 0.5	677.8	(50.7)	(268.9)		686.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		3.6					(15.7)		19.3
Equity-based compensation (shares)				3,000
Equity-based compensation		2.7			2.7
Preferred dividends		(9.1)			(9.1)
Other comprehensive income (loss)		(6.8)				(6.8)
Acquisition and disposal of shares of non-controlling interests, net	[1]	(9.0)			(1.1)				(7.9)
Distributions to non-controlling interests—non-redeemable holders		(19.9)							(19.9)
Ending Balance, stockholders' equity (shares) at Sep. 30, 2019				49,506,000
Ending Balance, stockholders' equity at Sep. 30, 2019		$ 1,006.5		$ 0.5	670.3	(57.5)	(284.6)		677.8
Beginning Balance, stockholders' equity (shares) at Dec. 31, 2019		49,298,940		49,299,000
Beginning Balance, stockholders' equity at Dec. 31, 2019		$ 983.4		$ 0.5	662.7	(50.7)	(315.7)		686.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(13.9)					(27.5)		13.6
Equity-based compensation (shares)				1,219,000
Equity-based compensation		2.8			2.8
Preferred dividends		(9.5)			(9.5)
Other comprehensive income (loss)		(25.2)				(25.2)
Acquisition and disposal of shares of non-controlling interests, net	[1]	0.7			(0.7)				1.4
Distributions to non-controlling interests—non-redeemable holders		(14.9)							(14.9)
Ending Balance, stockholders' equity (shares) at Mar. 31, 2020				50,518,000
Ending Balance, stockholders' equity at Mar. 31, 2020		$ 923.4		$ 0.5	655.3	(75.9)	(343.2)		686.7
Beginning Balance, stockholders' equity (shares) at Dec. 31, 2019		49,298,940		49,299,000
Beginning Balance, stockholders' equity at Dec. 31, 2019		$ 983.4		$ 0.5	662.7	(50.7)	(315.7)		686.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)		$ (14.6)
Ending Balance, stockholders' equity (shares) at Sep. 30, 2020		50,494,605		50,495,000
Ending Balance, stockholders' equity at Sep. 30, 2020		$ 800.8		$ 0.5	603.3	(65.3)	(437.3)		699.6
Beginning Balance, stockholders' equity (shares) at Mar. 31, 2020				50,518,000
Beginning Balance, stockholders' equity at Mar. 31, 2020		923.4		$ 0.5	655.3	(75.9)	(343.2)		686.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(9.7)					(32.5)		22.8
Equity-based compensation (shares)				33,000
Equity-based compensation		3.8			3.8
Preferred dividends		(9.7)			(9.7)
Other comprehensive income (loss)		7.3				7.3
Acquisition and disposal of shares of non-controlling interests, net	[1]	1.7			(1.2)				2.9
Distributions to non-controlling interests—non-redeemable holders		(20.9)							(20.9)
Ending Balance, stockholders' equity (shares) at Jun. 30, 2020				50,551,000
Ending Balance, stockholders' equity at Jun. 30, 2020		895.9		$ 0.5	648.2	(68.6)	(375.7)		691.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(42.3)					(61.6)		19.3
Equity-based compensation (shares)				(56,000)
Equity-based compensation		3.0			3.0
Preferred dividends		(10.0)			(10.0)
Other comprehensive income (loss)		3.3				3.3
Acquisition and disposal of shares of non-controlling interests, net	[1]	(30.3)			(37.9)				7.6
Distributions to non-controlling interests—non-redeemable holders		$ (18.8)							(18.8)
Ending Balance, stockholders' equity (shares) at Sep. 30, 2020		50,494,605		50,495,000
Ending Balance, stockholders' equity at Sep. 30, 2020		$ 800.8		$ 0.5	$ 603.3	$ (65.3)	$ (437.3)		$ 699.6

[1] Includes post acquisition date adjustments.