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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 6,796.2 $ 6,542.1
Cash Equivalents At Gross Unrealized Gains 0.0 0.0
Cash Equivalents At Gross Unrealized Losses 0.0 0.0
Money market securities and other cash equivalents - Fair Value 6,796.2 6,542.1
Total available-for-sale securities - Amortized Cost 24,571.6 23,131.9
Available for Sale Securities - Unrealized Gains 320.6 36.7
Available for sale securities - Unrealized Loss (33.1) (392.4)
Total available-for-sale securities - Fair Value 24,859.1 [1] 22,776.2 [2]
Total corporate investments and funds held for clients - Amortized Cost 31,367.8 29,674.0
Total corporate investments and funds held for clients - Gross Unrealized Gains 320.6 36.7
Total corporate investments and funds held for clients - Gross Unrealized Losses (33.1) (392.4)
Total corporate investments and funds held for clients - Fair Value 31,655.3 29,318.3
Corporate Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 10,691.8 9,819.4
Available for Sale Securities - Unrealized Gains 182.8 20.3
Available for sale securities - Unrealized Loss (6.7) (160.9)
Total available-for-sale securities - Fair Value 10,867.9 9,678.8
Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 4,658.3 4,555.5
Available for Sale Securities - Unrealized Gains 37.8 0.3
Available for sale securities - Unrealized Loss (5.4) (64.1)
Total available-for-sale securities - Fair Value 4,690.7 4,491.7
U.S. Treasury And Direct Obligations Of U.S. Government Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 2,612.0 2,787.0
Available for Sale Securities - Unrealized Gains 17.7 4.0
Available for sale securities - Unrealized Loss (5.8) (47.7)
Total available-for-sale securities - Fair Value 2,623.9 2,743.3
US Treasury and Government [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 2,933.0 2,678.9
Available for Sale Securities - Unrealized Gains 23.8 0.4
Available for sale securities - Unrealized Loss (8.0) (76.9)
Total available-for-sale securities - Fair Value 2,948.8 2,602.4
Canadian Government Obligations And Canadian Government Agency Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 1,164.1 1,109.0
Available for Sale Securities - Unrealized Gains 7.0 0.4
Available for sale securities - Unrealized Loss (6.0) (20.6)
Total available-for-sale securities - Fair Value 1,165.1 1,088.8
Canadian Provincial Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 800.2 724.5
Available for Sale Securities - Unrealized Gains 14.5 5.1
Available for sale securities - Unrealized Loss (0.5) (7.4)
Total available-for-sale securities - Fair Value 814.2 722.2
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 596.1 584.6
Available for Sale Securities - Unrealized Gains 16.4 3.2
Available for sale securities - Unrealized Loss (0.1) (4.3)
Total available-for-sale securities - Fair Value 612.4 583.5
Other Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 1,116.1 873.0
Available for Sale Securities - Unrealized Gains 20.6 3.0
Available for sale securities - Unrealized Loss (0.6) (10.5)
Total available-for-sale securities - Fair Value 1,136.1 865.5
Corporate Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Fair Value 271.9 10.5
Funds Held For Clients [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Fair Value $ 24,587.2 $ 22,765.7
[1] Included within available-for-sale securities are corporate investments with fair values of $271.9 million and funds held for clients with fair values of $24,587.2 million. All available-for-sale securities are included in Level 2 of the fair value hierarchy.
[2] (B) 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.