Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans - Cash Long-Term Incentive Plan (Details)

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Equity and Long-Term Incentive Compensation Plans - Cash Long-Term Incentive Plan (Details)
$ in Millions
 3 Months Ended
Sep. 30, 2015
USD ($)
vesting_installment
Sep. 30, 2014
USD ($)
Cash Long-Term Incentive Plan    
Cash-based long-term incentive plan, approved amount $ 0.3 $ 1.6
Cash Long-Term Incentive Plan    
Cash Long-Term Incentive Plan    
Cash long-term incentive plan, number of equal vesting installments | vesting_installment 4  
Cash long-term incentive plan, percentage of equal vesting installments 25.00%  
Cash long-term incentive plan, vesting period 4 years  
Cash long-term incentive program, compensation expense $ 9.9 $ 7.8
Cash long-term incentive plan, unrecognized compensation balance $ 81.6