CONDENSED CONSOLIDATED STATEMENTS OF 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	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	(0.2)	(0.2)
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
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	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	[2]
Cumulative effect of accounting change | ASU 2018-02 [Member]			$ 10.9	$ (10.9)

[1] Condensed from audited financial statements

[2] Unaudited