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Employee Benefit Plans (Investments of the Plan Measured at Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 2,306.3 | $ 1,988.8 | $ 1,910.5
Commingled trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,060.2 | 798.6 |
Commingled trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Commingled trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,060.2 | 798.6 |
Commingled trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 426.2 | 414.7 |
U.S. government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
U.S. government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 426.2 | 414.7 |
U.S. government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 355.9 | 282.1 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 10.2 | 7.3 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 345.7 | 274.8 |
Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Corporate and municipal bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 417.2 | 434.8 |
Corporate and municipal bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Corporate and municipal bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 417.2 | 434.8 |
Corporate and municipal bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Mortgage-backed security bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 38.6 | 38.5 |
Mortgage-backed security bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Mortgage-backed security bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 38.6 | 38.5 |
Mortgage-backed security bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Total pension asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2,298.1 | 1,968.7 |
Total pension asset investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 10.2 | 7.3 |
Total pension asset investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2,287.9 | 1,961.4 |
Total pension asset investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 0.0 | $ 0.0 |

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