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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 5,484.0 $ 6,542.1
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 5,484.0 6,542.1
Available-for-sale securities - Amortized Cost 23,154.4 23,131.9
Available-for-sale securities - Gross Unrealized Gains 47.3 36.7
Available-for-sale securities - Gross Unrealized Losses (283.6) (392.4)
Available-for-sale securities - Fair Market Value 22,918.1 [1] 22,776.2 [2]
Total corporate investments and funds held for clients - Amortized Cost 28,638.4 29,674.0
Total corporate investments and funds held for clients - Gross Unrealized Gains 47.3 36.7
Total corporate investments and funds held for clients - Gross Unrealized Losses (283.6) (392.4)
Total corporate investments and funds held for clients - Fair Market Value 28,402.1 29,318.3
Corporate Investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 10.6 10.5
Funds Held For Clients    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Market Value 22,907.5 22,765.7
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 9,946.3 9,819.4
Available-for-sale securities - Gross Unrealized Gains 21.0 20.3
Available-for-sale securities - Gross Unrealized Losses (124.6) (160.9)
Available-for-sale securities - Fair Market Value 9,842.7 9,678.8
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 4,551.3 4,555.5
Available-for-sale securities - Gross Unrealized Gains 4.2 0.3
Available-for-sale securities - Gross Unrealized Losses (44.2) (64.1)
Available-for-sale securities - Fair Market Value 4,511.3 4,491.7
U.S. government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,703.0 2,787.0
Available-for-sale securities - Gross Unrealized Gains 4.6 4.0
Available-for-sale securities - Gross Unrealized Losses (34.8) (47.7)
Available-for-sale securities - Fair Market Value 2,672.8 2,743.3
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,741.0 2,678.9
Available-for-sale securities - Gross Unrealized Gains 3.3 0.4
Available-for-sale securities - Gross Unrealized Losses (52.5) (76.9)
Available-for-sale securities - Fair Market Value 2,691.8 2,602.4
Canadian government obligations and Canadian government agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 1,062.2 1,109.0
Available-for-sale securities - Gross Unrealized Gains 1.2 0.4
Available-for-sale securities - Gross Unrealized Losses (13.8) (20.6)
Available-for-sale securities - Fair Market Value 1,049.6 1,088.8
Canadian provincial bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 698.6 724.5
Available-for-sale securities - Gross Unrealized Gains 4.4 5.1
Available-for-sale securities - Gross Unrealized Losses (4.4) (7.4)
Available-for-sale securities - Fair Market Value 698.6 722.2
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 596.7 584.6
Available-for-sale securities - Gross Unrealized Gains 4.8 3.2
Available-for-sale securities - Gross Unrealized Losses (2.3) (4.3)
Available-for-sale securities - Fair Market Value 599.2 583.5
Other securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 855.3 873.0
Available-for-sale securities - Gross Unrealized Gains 3.8 3.0
Available-for-sale securities - Gross Unrealized Losses (7.0) (10.5)
Available-for-sale securities - Fair Market Value $ 852.1 $ 865.5
[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 $22,907.5 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 $10.5 million and funds held for clients with fair values of $22,765.7 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.