Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
Effective income tax rate on continuing operations (as a percent)			42.50%	32.20%
Discrete tax expense (benefit) related to state valuation allowance release			$ (0.8)	$ (3.3)
Impairment charges		$ 141.5	$ 141.5
Forecast
Anticipated tax benefit, impairment charge	$ 8.9
Anticipated effective tax rate for beginning of year to date (as a percent)					33.00%