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]	Treasury Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Foreign Currency Translation Adjustment [Member]	Deferred Gain (Loss) on Cash Flow Hedging [Member]	Pension Adjustment [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2012	$ 342.2	$ 341.3	$ 0.1	$ 0.1	$ (2.2)	$ 308.2	$ 95.1	$ 13.2	$ 1.5	$ (74.7)	$ 0.9
Capital in Excess of Par Value
Stock-based compensation	4.7	4.7				4.7
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0	0			1.6	(1.6)
Treasury Stock, Value, Acquired, Cost Method	(3.0)	(3.0)			(3.0)
Retained Earnings
Net Income Attributable to Stockholders	60.8	60.8					60.8
Cash dividends	(8.4)	(8.4)					(8.4)
Accumulated Other Comprehensive Income (Loss)
Foreign currency translation adjustment	(14.0)							(14.0)
Deferred gain (loss) on cash flow hedging	(3.1)								(3.1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(17.1)	(17.1)
Reclassification of hedging activities into earnings	1.6								1.6
Reclassification of pension into earnings	2.7									2.7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	4.3	4.3
Net income attributable to noncontrolling interest	0
Balance at Jun. 30, 2013	383.5	382.6	0.1	0.1	(3.6)	311.3	147.5	(0.8)	0	(72.0)	0.9
Balance at Dec. 31, 2013	450.9	449.8	0.1	0.1	(3.4)	320.6	188.4	1.3	(1.9)	(55.4)	1.1
Capital in Excess of Par Value
Stock-based compensation	3.6	3.6				3.6
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0	0			2.3	(2.3)
Treasury Stock, Value, Acquired, Cost Method	(9.1)	(9.1)			(9.1)
Retained Earnings
Net Income Attributable to Stockholders	55.0	55.0					55.0
Cash dividends	(8.8)	(8.8)					(8.8)
Accumulated Other Comprehensive Income (Loss)
Foreign currency translation adjustment	3.2							3.2
Deferred gain (loss) on cash flow hedging	0.4								0.4
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3.6	3.6
Reclassification of hedging activities into earnings	0.9								0.9
Reclassification of pension into earnings	2.3									2.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3.2	3.2
Net income attributable to noncontrolling interest	0.1										0.1
Balance at Jun. 30, 2014	$ 498.5	$ 497.3	$ 0.1	$ 0.1	$ (10.2)	$ 321.9	$ 234.6	$ 4.5	$ (0.6)	$ (53.1)	$ 1.2