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Funds Held for Clients and Corporate Investments (Realized Gains and Losses from Sale of Available-for-sale Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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May 31, 2020 | [1] | Feb. 29, 2020 | [1] | Nov. 30, 2019 | [1] | Aug. 31, 2019 | [1] | May 31, 2019 | [1] | Feb. 28, 2019 | [1] | Nov. 30, 2018 | [1] | Aug. 31, 2018 | [1] | May 31, 2020 | May 31, 2019 | May 31, 2018
Funds Held for Clients and Corporate Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | $ 11.6 |  | $ 0.6 | $ 0.3
Gross realized losses |  |  |  |  |  |  |  |  | (0.3) |  | $ (0.6) | (0.2)
Net realized gains | $ 8.9 | $ 0.6 | $ 0.9 | $ 0.9 | $ 0.1 | $ 0.1 | $ (0.3) | $ 0.1 | $ 11.3 | [1] |  | $ 0.1
[1] | Total net realized gains/(losses) on the combined funds held for clients and corporate investment portfolios.

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- Definition Funds held for clients and corporate investments. + References No definition available. + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References No definition available. + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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