Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	Feb. 28, 2018	May 31, 2018	Dec. 31, 2017	May 31, 2018
U.S. federal statutory income tax rate (as a percent)			35.00%
Income tax expense (benefit)	$ 1.8
Income tax benefit for the re-measurement impact on a provisional basis	$ 13.0
Forecast
U.S. federal statutory income tax rate (as a percent)		21.00%		29.20%