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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
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Sep. 30, 2017 USD ($) Installment | Sep. 30, 2016 USD ($)
Cash Long-Term Incentive Plan |  |
Cash-based long-term incentive plan, granted amount | $ 2.1 | $ 1.6
Cash long-term incentive plan, compensation expense | 14.8 | $ 12.2
Cash long-term incentive plan, unrecognized compensation balance | $ 113.4 |
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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