Unaudited Condensed Consolidated Statements of Changes in Equity (USD $) In Millions, unless otherwise specified	Total	Parent [Member]	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Foreign Currency Translation Adjustment [Member]	Deferred Gain (Loss) on Cash Flow Hedges [Member]	Pension and Postretirement Plans Adjustment [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2010					$ 22.6	$ 475.4		$ 28.1	$ (9.0)	$ (78.1)
Capital in Excess of Par Value
Stock-based compensation					0.7
Shares issued under stock compensation plans					0.1
Purchase of treasury shares					0
Retained Earnings
Net income attributable to stockholders	62.8					62.8
Cash dividends on Class A and Class B common stock:
Cash dividends						(4.4)
Accumulated Other Comprehensive Income (Loss)
Foreign currency translation adjustment								10.2
Deferred gain (loss) on cash flow hedging									(4.7)
Deferred gain (loss) reclassification adjustment to net income									1.9
Reclassification of pension and postretirement activity into earnings										1.9
Balance at Mar. 31, 2011	516.7	515.9	6.8	1.6	23.4	533.8	(49.7)	38.3	(11.8)	(76.2)	0.8
Balance at Dec. 31, 2011	577.0				22.7	619.7		13.2	2.6	(90.4)
Capital in Excess of Par Value
Stock-based compensation					0.9
Shares issued under stock compensation plans					0.2
Purchase of treasury shares					(0.6)
Retained Earnings
Net income attributable to stockholders	25.2					25.2
Cash dividends on Class A and Class B common stock:
Cash dividends						(4.5)
Accumulated Other Comprehensive Income (Loss)
Foreign currency translation adjustment								10.9
Deferred gain (loss) on cash flow hedging									(0.6)
Deferred gain (loss) reclassification adjustment to net income									0.2
Reclassification of pension and postretirement activity into earnings										2.0
Balance at Mar. 31, 2012	$ 610.7	$ 609.9	$ 6.8	$ 1.6	$ 23.2	$ 640.4	$ (62.1)	$ 24.1	$ 2.2	$ (88.4)	$ 0.8