Summary of Significant Accounting Policies (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Revenue Recognition
Period for which products are warranted to be free from defect (in years)	1
Number of years past due for deferring revenue when collectability is not reasonably assured (in years)	1
Shipping and handling costs
Shipping and handling costs	$ 28.7	$ 20.8	$ 14.0
Advertising
Advertising expenses	$ 8.1	$ 9.1	$ 6.9
ASC 2009-13
Recent Accounting Pronouncements
Number of significant changes to the existing guidance for multiple element arrangements (in Years)	3