CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Non-controlling Interests [Member]	Total
Balance at Dec. 31, 2017	$ 4.9	$ 422.7	$ 1,607.2	$ (186.1)	$ (597.0)	$ 27.4	$ 1,279.1
Net income	0.0	0.0	39.9	0.0	0.0	1.2	41.1
Other comprehensive income (loss)	0.0	0.0	0.0	18.2	0.0	0.5	18.7
Dividends declared	0.0	0.0	(1.8)	0.0	0.0	0.0	(1.8)
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	0.5	0.0	0.0	0.0	0.0	0.5
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(5.7)	0.0	(5.7)
Balance at Apr. 01, 2018	4.9	423.2	1,645.3	(167.9)	(602.7)	29.0	1,331.8
Balance at Dec. 31, 2017	4.9	422.7	1,607.2	(186.1)	(597.0)	27.4	1,279.1
Net income							129.2
Other comprehensive income (loss)							(54.1)
Balance at Sep. 30, 2018	4.9	429.6	1,727.9	(238.8)	(613.4)	31.4	1,341.6
Balance at Apr. 01, 2018	4.9	423.2	1,645.3	(167.9)	(602.7)	29.0	1,331.8
Net income	0.0	0.0	44.1	0.0	0.0	1.1	45.2
Other comprehensive income (loss)	0.0	0.0	0.0	(52.3)	0.0	(1.6)	(53.9)
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	0.0	0.0
Issuance of shares pursuant to employee stock compensation plans	0.0	1.4	0.0	0.0	0.0	0.0	1.4
Stock-based compensation	0.0	2.3	0.0	0.0	0.0	0.0	2.3
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(7.7)	0.0	(7.7)
Balance at Jul. 01, 2018	4.9	426.9	1,687.7	(220.2)	(610.4)	28.5	1,317.4
Net income	0.0	0.0	41.9	0.0	0.0	1.0	42.9
Other comprehensive income (loss)	0.0	0.0	0.0	(18.6)	0.0	(0.3)	(18.9)
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	(1.5)	(1.5)
Issuance of shares pursuant to employee stock compensation plans	0.0	0.3	0.0	0.0	0.0	0.0	0.3
Stock-based compensation	0.0	2.4	0.0	0.0	0.0	0.0	2.4
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(3.0)	0.0	(3.0)
Balance at Sep. 30, 2018	4.9	429.6	1,727.9	(238.8)	(613.4)	31.4	1,341.6
Cumulative effect of accounting change | ASU 2018-02 [Member]	0.0	0.0	10.9	(10.9)	0.0	0.0	0.0
Balance at Dec. 31, 2018	4.9	431.9	1,769.1	(233.7)	(618.7)	31.8	1,385.3	[1]
Net income	0.0	0.0	39.1	0.0	0.0	0.9	40.0
Other comprehensive income (loss)	0.0	0.0	0.0	1.9	0.0	0.5	2.4
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)
Capital contribution from non-controlling interests	0.0	0.0	0.0	0.0	0.0	0.8	0.8
Issuance of shares pursuant to employee stock compensation plans	0.0	0.1	0.0	0.0	0.0	0.0	0.1
Stock-based compensation	0.0	0.6	0.0	0.0	0.0	0.0	0.6
Balance at Mar. 31, 2019	4.9	432.6	1,817.4	(242.7)	(618.7)	33.9	1,427.4
Balance at Dec. 31, 2018	4.9	431.9	1,769.1	(233.7)	(618.7)	31.8	1,385.3	[1]
Net income							106.7
Other comprehensive income (loss)				(34.4)			(34.8)
Balance at Sep. 29, 2019	4.9	438.1	1,878.4	(279.0)	(639.7)	30.9	1,433.6	[2]
Balance at Mar. 31, 2019	4.9	432.6	1,817.4	(242.7)	(618.7)	33.9	1,427.4
Net income	0.0	0.0	26.6	0.0	0.0	1.0	27.6
Other comprehensive income (loss)	0.0	0.0	0.0	(20.1)	0.0	(0.2)	(20.3)
Dividends declared	0.0	0.0	(1.8)	0.0	0.0	0.0	(1.8)
Dividends paid to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(3.8)	(3.8)
Capital distribution to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(0.2)	(0.2)
Issuance of shares pursuant to employee stock compensation plans	0.0	0.2	0.0	0.0	0.0	0.0	0.2
Stock-based compensation	0.0	2.5	0.0	0.0	0.0	0.0	2.5
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(10.0)	0.0	(10.0)
Balance at Jun. 30, 2019	4.9	435.3	1,842.2	(262.8)	(628.7)	30.7	1,421.6
Net income	0.0	0.0	38.0	0.0	0.0	1.1	39.1
Other comprehensive income (loss)	0.0	0.0	0.0	(16.2)	0.0	(0.8)	(17.0)
Dividends declared	0.0	0.0	(1.8)	0.0	0.0	0.0	(1.8)
Dividends paid to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(0.1)	(0.1)
Capital contribution from non-controlling interests	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Issuance of shares pursuant to employee stock compensation plans	0.0	0.3	0.0	0.0	0.0	0.0	0.3
Stock-based compensation	0.0	2.5	0.0	0.0	0.0	0.0	2.5
Purchase of common stock for treasury	0.0	0.0	0.0	0.0	(11.0)	0.0	(11.0)
Balance at Sep. 29, 2019	$ 4.9	$ 438.1	$ 1,878.4	$ (279.0)	$ (639.7)	$ 30.9	$ 1,433.6	[2]

[1] Condensed from audited financial statements

[2] Unaudited