Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021		Mar. 31, 2020
Income Statement [Abstract]
Net sales		$ 1,318.0	$ 1,197.1	$ 2,894.5		$ 2,612.5
Cost of products sold		985.2	926.7	2,162.0		2,001.9
Gross profit		332.8	270.4	732.5		610.6
Operating expense:
Selling, general and administrative		267.8	262.7	533.0		536.0
Depreciation		14.6	14.5	28.5		30.3
Amortization		27.6	168.8	53.1		200.8
Total operating expense		310.0	446.0	614.6		767.1
Income (loss) from operations		22.8	(175.6)	117.9		(156.5)
Interest expense, financing costs, and other		28.6	23.6	58.6		62.1
Loss on debt extinguishment		9.5	0.0	9.5	[1]	14.7	[1]
Income (loss) from continuing operations before income taxes		(15.3)	(199.2)	49.8		(233.3)
Provision for (benefit from) income taxes		(4.8)	(77.9)	12.9		(88.0)
Net income (loss) from continuing operations		(10.5)	(121.3)	36.9		(145.3)
Net income (loss) from discontinued operations	[2]	4.2	(1.3)	(263.7)		(0.7)
Net income (loss)		(6.3)	(122.6)	(226.8)		(146.0)
Dividends on Preferred Stock		6.0	6.0	12.0		12.0
Net income (loss) attributable to common shareholders		$ (12.3)	$ (128.6)	$ (238.8)		$ (158.0)
Weighted-average common stock outstanding:
Basic		69,600,000	68,800,000	69,400,000		68,700,000
Diluted		69,600,000	68,800,000	70,300,000		68,700,000
Net income (loss) per share:
Basic - Continuing operations	[3]	$ (0.24)	$ (1.85)	$ 0.36		$ (2.29)
Basic - Discontinued operations	[3]	0.06	(0.02)	(3.80)		(0.01)
Basic net income (loss) per share	[3]	(0.18)	(1.87)	(3.44)		(2.30)
Diluted - Continuing operations	[3]	(0.24)	(1.85)	0.35		(2.29)
Diluted - Discontinued operations	[3]	0.06	(0.02)	(3.75)		(0.01)
Diluted net income (loss) per share	[3]	$ (0.18)	$ (1.87)	$ (3.40)		$ (2.30)

[1] Unless otherwise noted, amounts include both continuing and discontinued operations.

[2] See Note 3 for additional information.

[3] See Note 5 for detailed calculations and further discussion.