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Summary of Significant Accounting Policies Restricted Cash Restatement (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Restricted Cash Restatement      
Net decrease/(increase) in restricted cash and cash equivalents held to satisfy client funds obligations   $ 0.0 $ 0.0
Net Cash Provided by (Used in) Investing Activities $ (2,504.6) (1,113.2) [1] (869.0) [1]
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents 5.8 (8.0) [1] (8.7) [1]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (1,639.5) (7,277.0) [1] 9,772.3 [1]
Cash and Cash Equivalents, Period Increase (Decrease)     9,772.3
Cash Equivalents, at Carrying Value $ 6,542.1 8,181.6 15,458.6
Scenario, Previously Reported [Member]      
Restricted Cash Restatement      
Net decrease/(increase) in restricted cash and cash equivalents held to satisfy client funds obligations   6,843.6 (8,218.2)
Net Cash Provided by (Used in) Investing Activities   5,730.4 (9,087.2)
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents   14.7 (11.0)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   (410.7)  
Cash and Cash Equivalents, Period Increase (Decrease)     1,551.8
Cash Equivalents, at Carrying Value   2,780.4 3,191.1
Restatement Adjustment [Member]      
Restricted Cash Restatement      
Net decrease/(increase) in restricted cash and cash equivalents held to satisfy client funds obligations   (6,843.6) 8,218.2
Net Cash Provided by (Used in) Investing Activities   (6,843.6) 8,218.2
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents   (22.7) 2.3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   (6,866.3)  
Cash and Cash Equivalents, Period Increase (Decrease)     8,220.5
Cash Equivalents, at Carrying Value   $ 5,401.2 $ 12,267.5
[1] See Note 1 for a summary of adjustments.