Income Taxes, Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Line Items]
Statutory federal tax		35.00%		31.50%	35.00%	35.00%
Provisional discrete tax charges				$ 38.0
Deferred tax assets - change in amount				(19.0)
Transition tax charge				19.0
Transition tax liability	$ 19.0			$ 19.0
Estimated payment period for transition tax liability				8 years
Plan [Member]
Income Tax Disclosure [Line Items]
Statutory federal tax	21.00%		21.00%
Estimated transition tax liability to be paid in the future			$ 1.5