Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Valuation allowances	$ 25.1		$ 25.1		$ 10.3
Unrecognized income tax benefits	8.5		8.5		7.8
Unrecognized income tax benefits that would impact effective tax rate, if recognized	$ 7.7		7.7		$ 7.0
Unrecognized tax benefits, increase resulting from current period tax positions			$ 0.7
Effective tax rate	38.20%	24.80%	31.70%	26.60%
Change in deferred tax assets valuation allowance	$ 14.8		$ 14.8
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)			(1.2)	$ 3.4
Share-based compensation, excess tax expense (benefit)	$ (0.1)	$ 1.2	$ 0.7	$ (0.7)