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Settlement Assets and Obligations and Non-Settlement Related Investments - Components of Investment Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,261.4 $ 1,346.1
Fair Value 1,255.3 1,350.2
Gross Unrealized Gains 4.0 8.1
Gross Unrealized Losses (10.1) (4.0)
Net Unrealized Gains/ (Losses) (6.1) 4.1
Amortized Cost 1,346.0 1,402.3
Fair Value 1,339.9 1,406.4
Gross Unrealized Gains 4.0 8.1
Gross Unrealized Losses (10.1) (4.0)
Net Unrealized Gains/ (Losses) (6.1) 4.1
Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 41.1  
Fair Value 41.1  
Gross Unrealized Gains 0.0  
Gross Unrealized Losses 0.0  
Net Unrealized Gains/ (Losses) 0.0  
State and municipal debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 967.4 955.7
Fair Value 962.2 960.0
Gross Unrealized Gains 3.9 7.9
Gross Unrealized Losses (9.1) (3.6)
Net Unrealized Gains/ (Losses) (5.2) 4.3
State and municipal variable rate demand notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 205.5 319.6
Fair Value 205.5 319.6
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Unrealized Gains/ (Losses) 0.0 0.0
Corporate and other debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 78.6 60.9
Fair Value 78.0 60.8
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses (0.7) (0.3)
Net Unrealized Gains/ (Losses) (0.6) (0.1)
United States Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9.9 9.9
Fair Value 9.6 9.8
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.3) (0.1)
Net Unrealized Gains/ (Losses) (0.3) (0.1)
Foreign corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 43.5 56.2
Fair Value 43.5 56.2
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Unrealized Gains/ (Losses) $ 0.0 $ 0.0