Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Prior federal income tax rate				35.00%
Blended income tax rate				28.06%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent				21.00%
Restriction of deductibility of certain executive compensation				$ 1.0
Effective Income Tax Rate Reconciliation, Percent	(5.80%)		32.80%	25.20%	33.30%
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount				$ 1.2
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 0.5		$ 0.7