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Pension and Other Postretirement Benefits - Schedule of Fair Values of Pension Plan by Assets Category (Details) - USD ($) | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
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 | $ 972,500,000 | 987,600,000 | $ 885,100,000
Pension Benefits | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 17,100,000 | 24,000,000 |
Pension Benefits | Domestic and international equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 156,400,000 | 148,300,000 |
Pension Benefits | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 365,300,000 | 376,600,000 |
Pension Benefits | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 43,300,000 | 42,300,000 |
Pension Benefits | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 155,100,000 | 154,400,000 |
Pension Benefits | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 226,300,000 | 236,200,000 |
Pension Benefits | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,800,000 | 1,800,000 |
Pension Benefits | Mortgage/asset backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 7,200,000 | 4,000,000 |
Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 162,400,000 | 161,100,000 |
Pension Benefits | Level 1 | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2,500,000 | 9,400,000 |
Pension Benefits | Level 1 | Domestic and international equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 156,400,000 | 148,300,000 |
Pension Benefits | Level 1 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Level 1 | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Level 1 | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3,500,000 | 3,400,000 |
Pension Benefits | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 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 |
Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 399,700,000 | 405,800,000 |
Pension Benefits | Level 2 | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 14,600,000 | 14,600,000 |
Pension Benefits | Level 2 | Domestic and international equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Level 2 | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Level 2 | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Level 2 | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 151,600,000 | 151,000,000 |
Pension Benefits | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 226,300,000 | 236,200,000 |
Pension Benefits | Level 2 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Level 2 | Mortgage/asset backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 7,200,000 | 4,000,000 |
Pension Benefits | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 410,400,000 | 420,700,000 |
Pension Benefits | Net Asset Value | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 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 |
Pension Benefits | Net Asset Value | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 365,300,000 | 376,600,000 |
Pension Benefits | Net Asset Value | Limited partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 43,300,000 | 42,300,000 |
Pension Benefits | Net Asset Value | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Net Asset Value | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Pension Benefits | Net Asset Value | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,800,000 | 1,800,000 |
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 |

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