Quarterly report pursuant to Section 13 or 15(d)

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

v3.6.0.2
Equity and Long-Term Incentive Compensation Plans - Cash Long-Term Incentive Plan (Details) - Cash long-term incentive plan
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
vesting_installment
Dec. 31, 2015
USD ($)
Cash Long-Term Incentive Plan        
Cash-based long-term incentive plan, approved amount $ 50.3 $ 47.1 $ 50.3 $ 47.1
Cash long-term incentive plan, number of equal vesting installments | vesting_installment     4  
Cash long-term incentive plan, percentage of equal vesting installments (as a percent)     25.00%  
Cash long-term incentive plan, vesting period (in years)     4 years  
Cash long-term incentive program, compensation expense 11.2 $ 11.5 $ 23.4 $ 21.4
Cash long-term incentive plan, unrecognized compensation balance $ 108.4   $ 108.4