Business Combinations and Investments, Goodwill and Acquired Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Schedule of Acquired Intangible Asset by Major Class [Line Items]
Intangibles subject to amortization	$ 75.2
Intangibles not subject to amortization	37.1
Total acquired intangible assets	112.3
Weighted Average Useful Life in Years	9 years 6 months
Proprietary Technology [Member]
Schedule of Acquired Intangible Asset by Major Class [Line Items]
Intangibles subject to amortization	51.0
Weighted Average Useful Life in Years	9 years 6 months
Customer List/Relationships [Member]
Schedule of Acquired Intangible Asset by Major Class [Line Items]
Intangibles subject to amortization	22.9
Weighted Average Useful Life in Years	10 years 2 months
Backlog [Member]
Schedule of Acquired Intangible Asset by Major Class [Line Items]
Intangibles subject to amortization	1.2
Weighted Average Useful Life in Years	4 months 24 days
Trademarks [Member]
Schedule of Acquired Intangible Asset by Major Class [Line Items]
Intangibles subject to amortization	0.1
Weighted Average Useful Life in Years	1 year
Trademarks [Member]
Schedule of Acquired Intangible Asset by Major Class [Line Items]
Intangibles not subject to amortization	$ 37.1