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Summary of Significant Accounting Policies - Narrative (Details) shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) segment shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2016 USD ($) | Jun. 30, 2018 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  | 2 |  |  |  |
Percent of level two investment pricing inputs provided by independent pricing service (over) |  | 99.00% |  |  |  |
Debt instrument, face amount |  | $ 3,000,000,000.0 |  |  |  |
Notes payable |  | $ 3,006,900,000 | $ 2,008,400,000 |  |  |
Options excluded from the calculation of diluted earnings per share because their exercise prices exceeded the average market price (in shares) | shares |  | 1.1 | 1.2 | 0.7 |  |
Weighted average remaining useful life |  | 6 years |  |  |  |
Unrecognized tax benefits |  | $ 99,900,000 | $ 62,300,000 | $ 54,200,000 |  | $ 45,200,000
Threshold of coverage for all losses per occurrence covered by reinsurance arrangement, next fiscal year |  | 1,000,000 |  |  |  |
Concentration risk, credit risk, financial instruments, off-balance sheet risk |  | 273,000,000 |  |  |  |
Letters of credit outstanding, amount |  | 0 |  |  |  |
Payments for reinsurance |  | 240,000,000 |  |  |  |
Threshold for reinsurance per occurrence (up to) |  | $ 1,000,000 |  |  |  |
Subsequent Event |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Payments for reinsurance | $ 260,000,000 |  |  |  |  |
Internal Use Software |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Weighted average remaining useful life |  | 10 years |  |  |  |
Minimum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenue, service agreements, term |  | 30 days |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction |  | 5 years |  |  |  |
Revenue, incremental costs of obtaining a contract, period of recognition |  | 3 years |  |  |  |
Revenue, capitalized costs fulfillment period |  | 3 years |  |  |  |
Minimum | Internal Use Software |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Weighted average remaining useful life |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenue, service agreements, term |  | 5 years |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction |  | 7 years |  |  |  |
Revenue, incremental costs of obtaining a contract, period of recognition |  | 8 years |  |  |  |
Revenue, capitalized costs fulfillment period |  | 8 years |  |  |  |
Maximum | Internal Use Software |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Weighted average remaining useful life |  | 5 years |  |  |  |
Notes due on 2028 |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Debt instrument, term |  | 7 years |  |  |  |
Notes payable |  | $ 1,000,000,000.0 | 0 |  |  |
Notes due on 2030 |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Debt instrument, term |  | 10 years |  |  |  |
Notes payable |  | $ 1,000,000,000.0 | 0 |  |  |
Notes due on 2025 |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 10 years |
Debt instrument, face amount |  |  |  |  | $ 1,000,000,000.0 |
Notes payable |  | $ 1,000,000,000.0 | $ 1,000,000,000.0 |  |  |

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