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Pension and Other Postretirement Benefits - Schedule of Fair Values of Pension Plan by Assets Category (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 964.7 | 972.5 | $ 987.6
Pension Benefits | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 14.9 | 17.1 |
Pension Benefits | Domestic and international equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 132.6 | 156.4 |
Pension Benefits | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 371.4 | 365.3 |
Pension Benefits | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 45.4 | 43.3 |
Pension Benefits | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 176.8 | 155.1 |
Pension Benefits | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 220.2 | 226.3 |
Pension Benefits | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1.9 | 1.8 |
Pension Benefits | Mortgage/asset backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1.5 | 7.2 |
Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 144.7 | 162.4 |
Pension Benefits | Level 1 | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5.4 | 2.5 |
Pension Benefits | Level 1 | Domestic and international equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 132.6 | 156.4 |
Pension Benefits | Level 1 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 1 | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 1 | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 4.8 | 3.5 |
Pension Benefits | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1.9 | 0.0 |
Pension Benefits | Level 1 | Mortgage/asset backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 403.2 | 399.7 |
Pension Benefits | Level 2 | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 9.5 | 14.6 |
Pension Benefits | Level 2 | Domestic and international equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 2 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 2 | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 2 | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 172.0 | 151.6 |
Pension Benefits | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 220.2 | 226.3 |
Pension Benefits | Level 2 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Level 2 | Mortgage/asset backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1.5 | 7.2 |
Pension Benefits | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 416.8 | 410.4 |
Pension Benefits | Net Asset Value | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Net Asset Value | Domestic and international equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Net Asset Value | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 371.4 | 365.3 |
Pension Benefits | Net Asset Value | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 45.4 | 43.3 |
Pension Benefits | Net Asset Value | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Net Asset Value | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension Benefits | Net Asset Value | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 1.8 |
Pension Benefits | Net Asset Value | Mortgage/asset backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 0.0 | $ 0.0 |

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