Significant Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Customer relationships Y	Dec. 31, 2012 Other definite lived intangible assets Y
Goodwill and intangible assets
Useful life, minimum (in years)			3	3
Useful life, maximum (in years)			17	17
Weighted average amortization period (in years)			13.9	8.7
Foreign currency translation
Translation adjustments cumulative gain	$ 4.5	$ 16.2