Stock-based Compensation Plans Grants Table (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended		6 Months Ended
	Feb. 24, 2020	Jan. 28, 2020	Dec. 03, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture						$ 10.5
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares				118,684	162,433
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 12.14	$ 11.26
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture				$ 1.4	$ 1.8
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares				53,876	39,492
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 2.09	$ 1.97
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture				$ 0.1	$ 0.1
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares					188,973
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 11.26
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture					$ 2.1
Market Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	7,498	2,763	147,213	10,261	147,213	157,474
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 18.17	$ 16.76	$ 14.94	$ 17.79	$ 14.94
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture				$ 0.2	$ 2.2
Share-based Payment Arrangement, Tranche One [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares				13,682	65,428
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 12.09	$ 11.26
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture				$ 0.2	$ 0.7
Share-based Payment Arrangement, Tranche Two [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares					102,203
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 11.26
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture					$ 1.2
Share-based Payment Arrangement, Tranche Three [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares					44,451
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 11.26
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture					$ 0.5