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Acquisition of Cyrus Networks, LLC (Details) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Cyrus Networks [Member]	Sep. 30, 2011 Cyrus Networks [Member]	Jun. 11, 2010 Cyrus Networks [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price							$ 526
Business Acquisition, Purchase Price Allocation, Goodwill Amount							269.9
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets							138.0
Services	314.2	308.4	940.4	892.3	24.7	69.5
Operating Income (Loss)	86.3	82.6	250.3	234.8	5.5	18.0
Business Acquisition, Pro Forma Information [Abstract]
Revenue				1,045.8
Net income				$ 41.9
Basic earnings per common share				$ 0.17
Diluted earnings per common share				$ 0.17