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Significant Business Transactions and Events - Significant Contractual Matters (Details)
£ in Millions, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2017
GBP (£)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Bad debt expense     $ 37.5
Termination costs   $ 5.2  
International Financial Data Services U.K.      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Deferred revenue and termination payments     93.2
Bad debt expense     $ 34.5
Service agreement payment | £ £ 60.0