Quarterly report pursuant to Section 13 or 15(d)

Equity, Long-Term Incentive Compensation Plans and Non-controlling Interest - Cash-Based Long-Term Incentive Compensation (Details)

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Equity, Long-Term Incentive Compensation Plans and Non-controlling Interest - Cash-Based Long-Term Incentive Compensation (Details) - Cash long-term incentive plan
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Installment
Dec. 31, 2018
USD ($)
Cash Long-Term Incentive Plan        
Cash-based long-term incentive plan, granted amount     $ 4.3 $ 5.6
Cash long-term incentive plan, compensation expense $ 13.8 $ 12.0 30.4 $ 27.2
Cash long-term incentive plan, unrecognized compensation balance $ 121.0   $ 121.0  
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