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Significant Business Transactions - Summary of Intangible Assets Acquired and Estimated Useful Lives (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2017
Boston Financial Data Services, Inc.      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total revenues   $ 67.5 $ 132.9
Pretax income   12.3 14.2
Boston Financial Data Services, Inc. | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Fair value $ 57.2    
Weighted average useful life 13 years    
International Financial Data Services U.K.      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total revenues   112.7 313.8
Pretax income   $ 4.9 $ 65.6
International Financial Data Services U.K. | Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Fair value $ 104.0    
Weighted average useful life 10 years