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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment charge |  |  | $ 0.5 |
Discount rate | 3.57% |  |  |
Reduction in long-term pension liabilities | $ (18.7) |  |  |
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] |  |  |  |
Curtailment charge |  | $ 0.0 | $ 72.6 |
Discount rate |  | 4.32% | 3.92% |
Special termination benefits |  | $ 0.2 | $ 0.6 |
Employer contributions |  | 10.0 | 103.4 |
Pension Benefits | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discretionary contribution |  | 6.7 | 100.0 |
Special termination benefits |  |  |  | $ 9.4
Expected contributions for next fiscal year |  | 5.5 |  |
Pension Benefits | Qualified Plan | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | 6.7 | 100.0 | 0.0
Pension Benefits | Nonqualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | 3.3 | 3.5 | 3.2
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment charge |  | $ 0.0 | $ 0.0 |
Discount rate |  | 4.32% | 3.89% |
Special termination benefits |  | $ 0.0 | $ 0.0 |
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 |  | $ 3.3 | 3.2 |
Other Benefits | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan's current allocation policy |  | 87.00% |  |
Other Benefits | Fixed income securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan's current allocation policy |  | 13.00% |  |
Defined Contribution Retirement and Savings Plans | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions to defined contribution retirement and savings plans |  | $ 22.6 | $ 16.7 | $ 11.8

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