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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 7,053.6 $ 6,796.2
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 7,053.6 6,796.2
Total available-for-sale securities - Amortized Cost 20,699.8 24,571.6
Available for Sale Securities - Unrealized Gains 877.5 320.6
Available for sale securities - Unrealized Loss (0.7) (33.1)
Total available-for-sale securities - Fair Value 21,576.6 [1] 24,859.1 [2]
Total corporate investments and funds held for clients - Amortized Cost 27,753.4 31,367.8
Total corporate investments and funds held for clients - Gross Unrealized Gains 877.5 320.6
Total corporate investments and funds held for clients - Gross Unrealized Losses (0.7) (33.1)
Total corporate investments and funds held for clients - Fair Value 28,630.2 31,655.3
Corporate Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 9,188.7 10,691.8
Available for Sale Securities - Unrealized Gains 473.4 182.8
Available for sale securities - Unrealized Loss 0.0 (6.7)
Total available-for-sale securities - Fair Value 9,662.1 10,867.9
Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 3,274.6 4,658.3
Available for Sale Securities - Unrealized Gains 96.0 37.8
Available for sale securities - Unrealized Loss (0.5) (5.4)
Total available-for-sale securities - Fair Value 3,370.1 4,690.7
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 1,128.2 2,612.0
Available for Sale Securities - Unrealized Gains 35.6 17.7
Available for sale securities - Unrealized Loss 0.0 (5.8)
Total available-for-sale securities - Fair Value 1,163.8 2,623.9
US Treasury and Government [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 3,580.6 2,933.0
Available for Sale Securities - Unrealized Gains 120.8 23.8
Available for sale securities - Unrealized Loss 0.0 (8.0)
Total available-for-sale securities - Fair Value 3,701.4 2,948.8
Canadian Government Obligations And Canadian Government Agency Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 1,018.7 1,164.1
Available for Sale Securities - Unrealized Gains 23.1 7.0
Available for sale securities - Unrealized Loss 0.0 (6.0)
Total available-for-sale securities - Fair Value 1,041.8 1,165.1
Canadian Provincial Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 676.6 800.2
Available for Sale Securities - Unrealized Gains 33.6 14.5
Available for sale securities - Unrealized Loss 0.0 (0.5)
Total available-for-sale securities - Fair Value 710.2 814.2
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost   596.1
Available for Sale Securities - Unrealized Gains   16.4
Available for sale securities - Unrealized Loss   (0.1)
Total available-for-sale securities - Fair Value 592.7 612.4
Other Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 1,018.1 1,116.1
Available for Sale Securities - Unrealized Gains 41.1 20.6
Available for sale securities - Unrealized Loss (0.2) (0.6)
Total available-for-sale securities - Fair Value 1,059.0 1,136.1
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Amortized Cost 814.3  
Available for Sale Securities - Unrealized Gains 53.9  
Available for sale securities - Unrealized Loss 0.0  
Total available-for-sale securities - Fair Value 868.2  
Corporate Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Fair Value 13.6 271.9
Funds Held For Clients [Member]    
Debt Securities, Available-for-sale [Line Items]    
Total available-for-sale securities - Fair Value $ 21,563.0 $ 24,587.2
[1] Included within available-for-sale securities are corporate investments with fair values of $13.6 million and funds held for clients with fair values of $21,563.0 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 $271.9 million and funds held for clients with fair values of $24,587.2 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.