CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Non-controlling Interests [Member]	Total
Balance at Dec. 31, 2020	$ 4.9	$ 453.3	$ 2,011.3	$ (308.3)	$ (700.4)	$ 37.9	$ 1,498.7
Net income	0.0	0.0	164.4	0.0	0.0	4.1	168.5
Other comprehensive loss	0.0	0.0	0.0	(25.3)	0.0	0.0	(25.3)
Dividends declared	0.0	0.0	(6.8)	0.0	0.0	0.0	(6.8)
Dividends paid to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(1.8)	(1.8)
Issuance of shares pursuant to employee stock compensation plans	0.0	12.8	0.0	0.0	0.0	0.0	12.8
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(74.7)	0.0	(74.7)
Stock-based compensation	0.0	10.7	0.0	0.0	0.0	0.0	10.7
Conversion of RSU's for tax withholding	0.0	(2.6)	0.0	0.0	0.0	0.0	(2.6)
Balance at Dec. 31, 2021	4.9	474.2	2,168.9	(333.6)	(775.1)	40.2	1,579.5
Net income	0.0	0.0	122.2	0.0	0.0	4.1	126.3
Other comprehensive loss	0.0	0.0	0.0	(32.9)	0.0	(2.9)	(35.8)
Dividends declared	0.0	0.0	(6.5)	0.0	0.0	0.0	(6.5)
Dividends paid to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(7.7)	(7.7)
Issuance of shares pursuant to employee stock compensation plans	0.0	5.7	0.0	0.0	0.0	0.0	5.7
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(56.0)	0.0	(56.0)
Stock-based compensation	0.0	10.4	0.0	0.0	0.0	0.0	10.4
Conversion of RSU's for tax withholding	0.0	(2.7)	0.0	0.0	0.0	0.0	(2.7)
Balance at Dec. 31, 2022	4.9	487.6	2,284.6	(366.5)	(831.1)	33.7	1,613.2
Net income	0.0	0.0	84.1	0.0	0.0	4.2	88.3
Other comprehensive loss	0.0	0.0	0.0	(2.9)	0.0	(0.9)	(3.8)
Dividends declared	0.0	0.0	(8.1)	0.0	0.0	0.0	(8.1)
Dividends paid to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(2.3)	(2.3)
Issuance of shares pursuant to employee stock compensation plans	0.0	5.1	0.0	0.0	0.0	0.0	5.1
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(14.2)	0.0	(14.2)
Stock-based compensation	0.0	11.3	0.0	0.0	0.0	0.0	11.3
Conversion of RSU's for tax withholding	0.0	(2.8)	0.0	0.0	0.0	0.0	(2.8)
Balance at Dec. 31, 2023	$ 4.9	$ 501.2	$ 2,360.6	$ (369.4)	$ (845.3)	$ 34.7	$ 1,686.7