Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 11.7	$ 9.7	$ 24.6	$ 18.5
Income tax expense as a percent of pre-tax income (loss)	23.20%	21.50%	23.50%	21.60%
Tax benefit due to changes in prior year tax positions		$ 1.8		$ 1.8
Tax Cuts and Jobs Act of 2017, tax expense (benefit) for transition tax		0.2
Discrete tax charge due to re-measurement of deferred tax assets and liabilities		$ 0.2