Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax benefit, including discontinued operations	$ (108.0)	$ 2.6
Tax credit		$ 1.2
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) [Line Items]
Valuation Allowances and Reserves, Period Increase (Decrease)	$ 112.6
Maximum
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) [Line Items]
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA)	35.00%
Minimum
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) [Line Items]
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA)	21.00%