Quarterly Results (Unaudited) - Schedule of Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Schedule of Quarterly Financial Information [Line Items]
Net sales	$ 766.1	$ 756.4	$ 1,412.6	$ 1,358.7
Consolidated segment revenues	766.1	757.4	1,412.6	1,359.7
Consolidated operating income	28.9	95.3	55.5	136.6
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(37.3)	(7.8)	40.8	(49.8)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0.7	(43.6)	501.5	259.2
Net income	(36.6)	(51.4)	542.3	209.4
Net Income (Loss) Attributable to Parent	(37.1)	(82.1)	470.3	130.1
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(37.5)	(24.4)	(8.7)	(71.6)
Net Income Loss Attributable To Common And Participating Preferred Stockholders	$ (37.1)	$ (82.1)	$ 470.3	$ 130.1
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.18)	$ (0.12)	$ (0.04)	$ (0.36)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.00	(0.29)	2.38	1.01
Earnings Per Share, Basic	(0.18)	(0.41)	2.34	0.65
Income (Loss) from Continuing Operations, Per Diluted Share	(0.18)	(0.12)	(0.04)	(0.36)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.00	(0.29)	2.38	1.01
Earnings Per Share, Diluted	$ (0.18)	$ (0.41)	$ 2.34	$ 0.65
Discontinued Operations, Held-for-sale [Member]
Schedule of Quarterly Financial Information [Line Items]
Consolidated segment revenues				$ 0.0
Consolidated operating income			$ 0.0	0.0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			459.9	187.7
Net income			459.9	187.7
Net Income (Loss) Attributable to Parent			$ 454.5	$ 160.2
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 0.4	$ (57.7)