Equity, Long-Term Incentive Compensation Plans and Non-controlling Interest - Cash-Based Long-Term Incentive Compensation (Details) - Cash long-term incentive plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Cash Long-Term Incentive Plan
Cash-based long-term incentive plan, granted amount			$ 7.9	$ 5.9
Cash long-term incentive plan, compensation expense	$ 12.2	$ 11.6	39.4	$ 37.9
Cash long-term incentive plan, unrecognized compensation balance	$ 93.7		$ 93.7