Nature of Business and Significant Accounting Policies (Details Textual) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Years	Dec. 31, 2010	Dec. 31, 2009
Cumulative translation gain included in accumulated other comprehensive earnings	$ (6.1)	$ 6.4
Gains and (losses) netted against other income, net	1.1	0.7	(3.9)
Carrying value of demonstration units	32.4	28.7
Advertising costs	11.1	9.2	8.2
Carrying value of cost-basis investments	10.5	10.4
Effect of stock-based compensation awards, shares excluded for purposes of diluted earnings per share	352	418	515
Unrecognized stock-based compensation costs, net of estimated forfeitures	33.3
Weighted average period of unrecognized stock-based compensation costs, net of estimated forfeitures	1.8
Allocation of performance-based stock options granted			30.00%
Allocation of time-based stock options granted			70.00%
Estimated forfeiture rate	5.00%
Cash received from the exercise of stock options	13.8	15.5	17.0
Related tax benefit realized from the exercise of the stock options	5.5	8.3	9.2
Level 1
Cash equivalents	$ 192.6	$ 27.2

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