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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 | 6 Months Ended
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Dec. 31, 2017 USD ($) Installment | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Cash Long-Term Incentive Plan |  |  |  |
Cash-based long-term incentive plan, granted amount |  |  | $ 4.0 | $ 50.3
Cash long-term incentive plan, compensation expense | $ 11.5 | $ 11.2 | 26.3 | $ 23.4
Cash long-term incentive plan, unrecognized compensation balance | $ 102.4 |  | $ 102.4 |
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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