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Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, cash and other cash equivalents - amortized cost | $ 1,602.2 | $ 1,908.5 | $ 1,500.4
Amortized Cost | 21,550.4 | 20,699.8 |
Gross Unrealized Gains | 802.3 | 877.5 |
Gross Unrealized Losses | (2.2) | (0.7) |
Fair market value | 22,350.5 | 21,576.6 |
Total corporate investments and funds held for clients - amortized cost | 37,678.9 | 27,753.4 |
Total corporate investments and funds held for clients - gross unrealized gains | 802.3 | 877.5 |
Total corporate investments and funds held for clients - gross unrealized losses | (2.2) | (0.7) |
Total corporate investments and funds held for clients - fair market value | 38,479.0 | 28,630.2 |
Corporate Investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 10.6 | 13.6 |
Funds Held For Clients |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair market value | 22,339.9 | 21,563.0 |
Corporate bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 10,266.6 | 9,188.7 |
Gross Unrealized Gains | 439.7 | 473.4 |
Gross Unrealized Losses | (0.9) | 0.0 |
Fair market value | 10,705.4 | 9,662.1 |
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 2,741.5 | 3,274.6 |
Gross Unrealized Gains | 87.3 | 96.0 |
Gross Unrealized Losses | 0.0 | (0.5) |
Fair market value | 2,828.8 | 3,370.1 |
U.S. government agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 3,609.3 | 3,580.6 |
Gross Unrealized Gains | 93.8 | 120.8 |
Gross Unrealized Losses | (0.1) | 0.0 |
Fair market value | 3,703.0 | 3,701.4 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,403.4 | 1,128.2 |
Gross Unrealized Gains | 30.4 | 35.6 |
Gross Unrealized Losses | (0.9) | 0.0 |
Fair market value | 1,432.9 | 1,163.8 |
Canadian government obligations and Canadian government agency obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,084.9 | 1,018.7 |
Gross Unrealized Gains | 21.8 | 23.1 |
Gross Unrealized Losses | (0.1) | 0.0 |
Fair market value | 1,106.6 | 1,041.8 |
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 805.8 | 814.3 |
Gross Unrealized Gains | 54.6 | 53.9 |
Gross Unrealized Losses | 0.0 | 0.0 |
Fair market value | 860.4 | 868.2 |
Canadian provincial bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 713.9 | 676.6 |
Gross Unrealized Gains | 34.5 | 33.6 |
Gross Unrealized Losses | (0.1) | 0.0 |
Fair market value | 748.3 | 710.2 |
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 925.0 | 1,018.1 |
Gross Unrealized Gains | 40.2 | 41.1 |
Gross Unrealized Losses | (0.1) | (0.2) |
Fair market value | 965.1 | 1,059.0 |
Money Market Funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, cash and other cash equivalents - amortized cost | 16,128.5 | 7,053.6 |
Money market securities and other cash equivalents - fair market value | $ 16,128.5 | $ 7,053.6 |

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