Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	27.40%	(5.80%)	23.70%	25.20%
Deferred tax remeasurement				$ 1.2	$ 0.5
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 1.5		$ 1.5
Tax Credit Carryforward, Valuation Allowance	0.2		0.2
Deferred Tax Assets, Foreign Tax Credit Carryforward, After Valuation Allowance	1.3		1.3
Amount of Foreign Tax Credit Carryforward Expiring in Fiscal 2021	0.6		0.6
Amount of Foreign Tax Credit Carryforward Expiring Between Fiscal 2023 and Fiscal 2025	$ 0.7		0.7
Discrete item impact on effective tax rate			$ 0.3
Expected effective tax rate			27.00%