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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]      
Money market securities and other cash equivalents - Amortized Cost $ 13,859.8 $ 8,181.6  
Money market securities and other cash equivalents - Gross Unrealized Gains 0.0 0.0  
Money market securities and other cash equivalents - Gross Unrealized Losses 0.0 0.0  
Money market securities and other cash equivalents - Fair Market Value 13,859.8 8,181.6 $ 11,721.5
Available-for-sale securities - Amortized Cost 22,432.2 21,798.6  
Available-for-sale securities - Gross Unrealized Gains 94.5 176.3  
Available-for-sale securities - Gross Unrealized Losses (151.2) (73.8)  
Available-for-sale securities - Fair Market Value 22,375.5 [1] 21,901.1 [2]  
Total corporate investments and funds held for clients - Amortized Cost 36,292.0 29,980.2  
Total corporate investments and funds held for clients - Gross Unrealized Gains 94.5 176.3  
Total corporate investments and funds held for clients - Gross Unrealized Losses (151.2) (73.8)  
Total corporate investments and funds held for clients - Fair Market Value 36,235.3 30,082.7  
Corporate Investments      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Fair Market Value 10.6 10.8  
Funds Held For Clients      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Fair Market Value 22,364.9 21,890.3  
Corporate bonds      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 9,435.9 9,325.3  
Available-for-sale securities - Gross Unrealized Gains 57.7 98.8  
Available-for-sale securities - Gross Unrealized Losses (39.7) (22.0)  
Available-for-sale securities - Fair Market Value 9,453.9 9,402.1  
Asset-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 4,445.0 4,453.1  
Available-for-sale securities - Gross Unrealized Gains 4.7 16.9  
Available-for-sale securities - Gross Unrealized Losses (22.0) (8.6)  
Available-for-sale securities - Fair Market Value 4,427.7 4,461.4  
U.S. government agency securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 2,913.6 3,557.7  
Available-for-sale securities - Gross Unrealized Gains 10.6 22.2  
Available-for-sale securities - Gross Unrealized Losses (22.8) (13.4)  
Available-for-sale securities - Fair Market Value 2,901.4 3,566.5  
U.S. Treasury securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 2,481.4 1,585.9  
Available-for-sale securities - Gross Unrealized Gains 1.0 2.6  
Available-for-sale securities - Gross Unrealized Losses (38.6) (14.3)  
Available-for-sale securities - Fair Market Value 2,443.8 1,574.2  
Canadian government obligations and Canadian government agency obligations      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 1,148.3 1,053.6  
Available-for-sale securities - Gross Unrealized Gains 0.9 2.9  
Available-for-sale securities - Gross Unrealized Losses (20.1) (11.4)  
Available-for-sale securities - Fair Market Value 1,129.1 1,045.1  
Canadian provincial bonds      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 760.8 746.9  
Available-for-sale securities - Gross Unrealized Gains 8.3 14.3  
Available-for-sale securities - Gross Unrealized Losses (3.3) (1.4)  
Available-for-sale securities - Fair Market Value 765.8 759.8  
Municipal bonds      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 586.0 582.5  
Available-for-sale securities - Gross Unrealized Gains 6.3 11.3  
Available-for-sale securities - Gross Unrealized Losses (2.0) (1.3)  
Available-for-sale securities - Fair Market Value 590.3 592.5  
Other securities      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities - Amortized Cost 661.2 493.6  
Available-for-sale securities - Gross Unrealized Gains 5.0 7.3  
Available-for-sale securities - Gross Unrealized Losses (2.7) (1.4)  
Available-for-sale securities - Fair Market Value $ 663.5 $ 499.5  
[1] Included within available-for-sale securities are corporate investments with fair values of $10.6 million and funds held for clients with fair values of $22,364.9 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
[2] Included within available-for-sale securities are corporate investments with fair values of $10.8 million and funds held for clients with fair values of $21,890.3 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.