Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Subsequent Events (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	May 01, 2020	Mar. 31, 2020	Mar. 31, 2019
Subsequent Event [Line Items]
Debt Securities, Available-for-sale		$ 24,023.6
Proceeds from the sales and maturities of corporate and client funds marketable securities		$ 4,749.9	$ 2,090.6
Subsequent Event
Subsequent Event [Line Items]
Debt Securities, Available-for-sale, Realized Gain	$ 0.7
Proceeds from the sales and maturities of corporate and client funds marketable securities	$ 1,300.0