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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 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2017
Boston Financial Data Services, Inc.      
Acquired Finite-Lived Intangible Assets [Line Items]      
Total revenues   $ 75.4 $ 76.8
Net pretax income   1.6 1.9
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   200.2 206.2
Net pretax income   $ 60.8 $ 60.7
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