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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage increase in funding level to shift assets from return seeking to liability hedging | 5.00% |  |
Percentage change in assets allocation from assets seeking to liability hedging due to increase in funding level | 4.00% |  |
Return Seeking Asset |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 60.00% |  |
Liability Matching Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 40.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 8.7 | $ 10.0 |
Pension Benefits | Qualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 5.5 | 6.7 | $ 100.0
Expected contributions for next fiscal year | 6.2 |  |
Pension Benefits | Nonqualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 3.2 | 3.3 | 3.5
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effect of one percentage point increase in the assumed health care cost trend rate on service and interest cost components | 0.1 |  |
Effect of one percentage point increase in the assumed health care cost trend rate on postretirement benefit obligation | 2.6 |  |
Effect of one percentage point decrease in the assumed health care cost trend rate on service and interest cost components | 0.1 |  |
Effect of one percentage point decrease in the assumed health care cost trend rate on postretirement benefit obligation | 2.3 |  |
Employer contributions | $ 3.2 | 3.3 |
Other Benefits | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 70.00% |  |
Other Benefits | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 23.00% |  |
Other Benefits | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 7.00% |  |
Defined Contribution Retirement and Savings Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to defined contribution retirement and savings plans | $ 24.8 | $ 22.6 | $ 16.7

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