CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock	Non-controlling interest	Total
Balance at Dec. 31, 2021	$ 0.3	$ 669.0	$ 401.1	$ (191.3)	$ (49.6)	$ 328.9	$ 1,158.4
Net income (loss)			99.6			47.0	146.6
Other comprehensive loss, net				(32.2)		(11.4)	(43.6)
Cash dividends			(6.7)				(6.7)
Dividends paid to noncontrolling interest						(27.5)	(27.5)
Equity transactions with noncontrolling interest, net and other		0.8				(3.5)	(2.7)
Balance at Sep. 30, 2022	0.3	669.8	494.0	(223.5)	(49.6)	333.5	1,224.5
Balance at Jun. 30, 2022	0.3	669.8	470.0	(207.8)	(49.6)	335.2	1,217.9
Net income (loss)			26.2			14.6	40.8
Other comprehensive loss, net				(15.7)		(5.5)	(21.2)
Cash dividends			(2.2)				(2.2)
Dividends paid to noncontrolling interest						(10.8)	(10.8)
Balance at Sep. 30, 2022	0.3	669.8	494.0	(223.5)	(49.6)	333.5	1,224.5
Balance at Dec. 31, 2022	0.3	669.5	482.3	(143.9)	(49.6)	348.2	1,306.8
Net income (loss)			(16.0)			8.2	(7.8)
Other comprehensive loss, net				(3.9)		(1.9)	(5.8)
Cash dividends			(6.8)				(6.8)
Dividends paid to noncontrolling interest						(19.0)	(19.0)
Equity transactions with noncontrolling interest, net and other						(2.2)	(2.2)
Balance at Sep. 30, 2023	0.3	669.5	459.5	(147.8)	(49.6)	333.3	1,265.2
Balance at Jun. 30, 2023	0.3	669.5	467.8	(147.2)	(49.6)	335.6	1,276.4
Net income (loss)			(6.0)			4.1	(1.9)
Other comprehensive loss, net				(0.6)		(0.1)	(0.7)
Cash dividends			(2.3)				(2.3)
Dividends paid to noncontrolling interest						(6.3)	(6.3)
Balance at Sep. 30, 2023	$ 0.3	$ 669.5	$ 459.5	$ (147.8)	$ (49.6)	$ 333.3	$ 1,265.2