CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Millions	Total	Preferred stock	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock	Non-controlling interest
Balance at Dec. 31, 2019	$ 980.1	$ 667.3	$ 0.3	$ 3.3	$ 239.4	$ (220.7)	$ (49.6)	$ 340.1
Net income	53.1				30.7			22.4
Other comprehensive income (loss), net	(3.3)					(2.2)		(1.1)
Dividends paid to noncontrolling interest	(21.1)							(21.1)
Cash dividends	(11.3)			(2.2)	(9.1)
Contribution of preferred stock		(667.3)		667.3
Equity transaction with noncontrolling interest, net and other	(0.5)			(0.1)	(0.3)			(0.1)
Balance at Sep. 30, 2020	997.0		0.3	668.3	260.7	(222.9)	(49.6)	340.2
Balance at Jun. 30, 2020	975.5	667.3	0.3	1.5	247.1	(232.0)	(49.6)	340.9
Net income	19.4				15.4			4.0
Other comprehensive income (loss), net	12.3					9.1		3.2
Dividends paid to noncontrolling interest	(7.9)							(7.9)
Cash dividends	(2.3)				(2.3)
Contribution of preferred stock		$ (667.3)		667.3
Equity transaction with noncontrolling interest, net and other				(0.5)	0.5
Balance at Sep. 30, 2020	997.0		0.3	668.3	260.7	(222.9)	(49.6)	340.2
Balance at Dec. 31, 2020	1,006.9		0.3	668.3	282.9	(219.4)	(49.6)	324.4
Net income	109.3				75.2			34.1
Other comprehensive income (loss), net	5.9					4.4		1.5
Dividends paid to noncontrolling interest	(45.3)							(45.3)
Cash dividends	(6.8)				(6.8)
Equity transaction with noncontrolling interest, net and other	(0.3)			1.2				(1.5)
Balance at Sep. 30, 2021	1,069.7		0.3	669.5	351.3	(215.0)	(49.6)	313.2
Balance at Jun. 30, 2021	1,045.4		0.3	669.5	314.6	(212.1)	(49.6)	322.7
Net income	54.5				39.0			15.5
Other comprehensive income (loss), net	(3.9)					(2.9)		(1.0)
Dividends paid to noncontrolling interest	(24.0)							(24.0)
Cash dividends	(2.3)				(2.3)
Balance at Sep. 30, 2021	$ 1,069.7		$ 0.3	$ 669.5	$ 351.3	$ (215.0)	$ (49.6)	$ 313.2