CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Millions	Common stock	Additional paid-in capital	Retained deficit	Accumulated other comprehensive loss	Treasury stock	Total
Beginning Balance at Dec. 31, 2020	$ 1.2	$ 1,395.3	$ (151.8)	$ (448.2)		$ 796.5
Net income			81.3			81.3
Other comprehensive income (loss), net of tax				6.5		6.5
Issuance of common stock		0.1				0.1
Dividends paid			(62.4)			(62.4)
Ending Balance at Sep. 30, 2021	1.2	1,395.4	(132.9)	(441.7)		822.0
Beginning Balance at Jun. 30, 2021	1.2	1,395.4	(148.1)	(437.3)		811.2
Net income			36.0			36.0
Other comprehensive income (loss), net of tax				(4.4)		(4.4)
Dividends paid			(20.8)			(20.8)
Ending Balance at Sep. 30, 2021	1.2	1,395.4	(132.9)	(441.7)		822.0
Ending Balance at Dec. 31, 2021	1.2	1,395.4	(122.1)	(404.1)	$ (0.2)	870.2
Net income			124.4			124.4
Other comprehensive income (loss), net of tax				(48.9)		(48.9)
Issuance of common stock		0.1				0.1
Dividends paid			(65.8)			(65.8)
Treasury stock acquired					(1.1)	(1.1)
Treasury stock retired		(1.3)			$ 1.3
Ending Balance at Sep. 30, 2022	1.2	1,394.2	(63.5)	(453.0)		878.9
Beginning Balance at Jun. 30, 2022	1.2	1,394.2	(62.6)	(429.2)		903.6
Net income			21.0			21.0
Other comprehensive income (loss), net of tax				(23.8)		(23.8)
Dividends paid			(21.9)			(21.9)
Ending Balance at Sep. 30, 2022	$ 1.2	$ 1,394.2	$ (63.5)	$ (453.0)		$ 878.9