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Acquisitions - Critical Infrastructure Business (Details) (Critical Infrastructure Business, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 30, 2011
Critical Infrastructure Business
   
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]    
Purchase price   $ 18.8
Recurring Critical Infrastructure Business revenues, percentage 15.00%  
Business Combination, Acquired Receivables [Abstract]    
Acquired accounts receivable, gross   24.4
Acquired accounts receivable, estimated uncollectible   $ (1.0)