CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Millions	Preferred stock	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock	Non-controlling interest	Total
Balance at Dec. 31, 2018	$ 667.3	$ 0.3	$ 3.3	$ 220.3	$ (206.2)	$ (49.6)	$ 353.6	$ 989.0
Net income				49.2			29.0	78.2
Cash dividends			(0.3)	(26.9)				(27.2)
Dividends paid to noncontrolling interest							(37.7)	(37.7)
Other comprehensive income (loss), net					(14.5)		(5.4)	(19.9)
Equity transactions with noncontrolling interest, net			0.3	(3.2)			0.6	(2.3)
Balance at Dec. 31, 2019	667.3	0.3	3.3	239.4	(220.7)	(49.6)	340.1	980.1
Net income				55.2			33.8	89.0
Cash dividends			(2.2)	(11.4)				(13.6)
Dividends paid to noncontrolling interest							(49.4)	(49.4)
Other comprehensive income (loss), net					1.3		0.1	1.4
Contribution of preferred stock	(667.3)		(667.3)
Equity transactions with noncontrolling interest, net			(0.1)	(0.3)			(0.2)	(0.6)
Balance at Dec. 31, 2020		0.3	668.3	282.9	(219.4)	(49.6)	324.4	1,006.9
Net income				127.2			70.5	197.7
Cash dividends				(9.0)				(9.0)
Dividends paid to noncontrolling interest							(74.4)	(74.4)
Other comprehensive income (loss), net					28.1		10.1	38.2
Equity transactions with noncontrolling interest, net	$ 0.0	0.0	0.7	0.0	0.0	0.0	(1.7)	(1.0)
Balance at Dec. 31, 2021		$ 0.3	$ 669.0	$ 401.1	$ (191.3)	$ (49.6)	$ 328.9	$ 1,158.4