CONDENSED 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, 2019	$ 4.9	$ 442.2	$ 1,905.7	$ (290.4)	$ (659.7)	$ 31.9	$ 1,434.6
Net income	0.0	0.0	38.6	0.0	0.0	1.0	39.6
Other comprehensive loss	0.0	0.0	0.0	(37.8)	0.0	(1.4)	(39.2)
Dividends declared	0.0	0.0	(1.7)	0.0	0.0	0.0	(1.7)
Capital contribution from non-controlling interests	0.0	0.0	0.0	0.0	0.0	0.7	0.7
Issuance of shares pursuant to employee stock compensation plans	0.0	0.5	0.0	0.0	0.0	0.0	0.5
Stock-based compensation	0.0	0.1	0.0	0.0	0.0	0.0	0.1
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(22.6)	0.0	(22.6)
Balance at Mar. 29, 2020	4.9	442.8	1,942.6	(328.2)	(682.3)	32.2	1,412.0
Balance at Dec. 31, 2020	4.9	453.3	2,011.3	(308.3)	(700.4)	37.9	1,498.7	[1]
Net income	0.0	0.0	39.9	0.0	0.0	1.1	41.0
Other comprehensive loss	0.0	0.0	0.0	(21.0)	0.0	(0.5)	(21.5)
Dividends declared	0.0	0.0	(1.7)	0.0	0.0	0.0	(1.7)
Dividends paid to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(0.1)	(0.1)
Issuance of shares pursuant to employee stock compensation plans	0.0	5.8	0.0	0.0	0.0	0.0	5.8
Stock-based compensation	0.0	2.8	0.0	0.0	0.0	0.0	2.8
Conversion of RSU's for tax withholding	0.0	(2.6)	0.0	0.0	0.0	0.0	(2.6)
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(20.0)	0.0	(20.0)
Balance at Apr. 04, 2021	$ 4.9	$ 459.3	$ 2,049.5	$ (329.3)	$ (720.4)	$ 38.4	$ 1,502.4	[2]

[1] Condensed from audited financial statements

[2] Unaudited