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Equity and Long-Term Incentive Compensation Plans - Cash-Based Long-Term Incentive Compensation (Details) - Cash long-term incentive plan $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) Installment | Mar. 31, 2017 USD ($)
Cash Long-Term Incentive Plan |  |  |  |
Cash-based long-term incentive plan, granted amount |  |  | $ 5.9 | $ 51.6
Cash long-term incentive plan, compensation expense | $ 11.6 | $ 11.3 | 37.9 | $ 34.7
Cash long-term incentive plan, unrecognized compensation balance | $ 91.4 |  | $ 91.4 |
Minimum |  |  |  |
Cash Long-Term Incentive Plan |  |  |  |
Cash long-term incentive plan, equal vesting installments | Installment |  |  | 3 |
Cash long-term incentive plan, percentage of equal vesting installments |  |  | 33.33% |
Cash long-term incentive plan, vesting period |  |  | 3 years |
Maximum |  |  |  |
Cash Long-Term Incentive Plan |  |  |  |
Cash long-term incentive plan, equal vesting installments | Installment |  |  | 4 |
Cash long-term incentive plan, percentage of equal vesting installments |  |  | 25.00% |
Cash long-term incentive plan, vesting period |  |  | 4 years |

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