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Acquisitions - SecureInfo Corporation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 24, 2012
Jun. 26, 2011
Jun. 24, 2012
Jun. 26, 2011
Dec. 25, 2011
Jun. 24, 2012
SecureInfo Corporation
Jun. 24, 2012
SecureInfo Corporation
Nov. 15, 2011
SecureInfo Corporation
Nov. 15, 2011
SecureInfo Corporation
Earnout
Nov. 15, 2011
SecureInfo Corporation
Holdback escrow
Nov. 15, 2011
SecureInfo Corporation
Purchase price adjustment
Business Acquisition, Cost of Acquired Entity [Abstract]                      
Purchase price               $ 20.3      
Contingent consideration, fair value 3.6   3.6   7.6       1.5 1.8  
Closing working capital cutoff                     2.2
Closing working capital, actual                     2.1
Working capital adjustment                     0.1
Business Combination, Acquired Receivables [Abstract]                      
Acquired accounts receivable, gross               2.9      
Acquired accounts receivable, estimated uncollectible               0      
Revenues 219.8 171.1 429.3 293.9   4.0 0.1        
Operating income (loss) $ 7.4 $ 8.7 $ 16.5 $ 10.1   $ 7.7 $ 0.3