Quarterly report pursuant to Section 13 or 15(d)

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

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Equity and Long-Term Incentive Compensation Plans - Cash-Based Long-Term Incentive Compensation (Details) - Cash long-term incentive plan - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Cash Long-Term Incentive Plan        
Cash-based long-term incentive plan, granted amount     $ 5.6 $ 4.0
Cash long-term incentive plan, compensation expense $ 12.0 $ 11.5 27.2 $ 26.3
Cash long-term incentive plan, unrecognized compensation balance $ 104.9   $ 104.9