Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Equity and Long-Term Incentive Compensation Plans - Cash Long-Term Incentive Plan (Details) - Cash long-term incentive plan
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
vesting_installment
Mar. 31, 2016
USD ($)
Cash Long-Term Incentive Plan        
Cash-based long-term incentive plan, approved amount $ 51.6 $ 47.8 $ 51.6 $ 47.8
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 11.3 $ 11.6 $ 34.7 $ 33.0
Cash long-term incentive plan, unrecognized compensation balance $ 97.6   $ 97.6