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Acquisitions (Narrative) (Details) (GXS Group, Inc. [Member], USD $)
0 Months Ended 3 Months Ended 25 Months Ended
Jan. 16, 2014
Mar. 31, 2014
Jan. 31, 2016
Scenario, Forecast [Member]
Business Acquisition [Line Items]      
Preliminary purchase consideration $ 1,218,830,000    
Purchase consideration, equity issuance (in shares) 2,595,042 2,595,042  
Escrow deposit related to business acquisition 60,000,000    
Escrow deposit related to business acquisition, disbursement amount     30,000,000
Acquired receivables, fair value 94,300,000    
Acquired receivables, gross contractual amount 108,200,000    
Acquired receivables, estimated uncollectible $ 13,900,000