Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2012	Mar. 31, 2013	Sep. 30, 2011	Mar. 31, 2013 Customer Relationships [Member]	Mar. 31, 2013 Technology [Member]	Mar. 31, 2013 Other Intangible Assets [Member]
Acquisitions (Textual) [Abstract]
Liabilities incurred			$ 10.9
Business Acquisition, Cost of Acquired Entity, Purchase Price		84.8
Business Acquisition, Purchase Price Allocation, Goodwill Amount		71.1
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Asset, Amount	$ 3.2			$ 7.1	$ 3.0	$ 1.0
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	10 years			10 years	5 years	5 years