Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales		$ 1,872.1	$ 1,549.3	$ 4,766.6	$ 4,161.7
Cost of products sold		1,354.7	1,180.6	3,516.7	3,182.5
Gross profit		517.4	368.7	1,249.9	979.2
Operating expense:
Selling, general and administrative		296.3	248.5	829.3	784.5
Depreciation		15.1	14.1	43.6	44.4
Amortization		25.2	30.9	78.3	231.7
Total operating expense		336.6	293.5	951.2	1,060.6
Income (loss) from operations		180.8	75.2	298.7	(81.4)
Interest expense, financing costs, and other		23.2	35.2	81.8	97.3
Loss on debt extinguishment		50.7	0.0	60.2	14.7
Income (loss) from continuing operations before income taxes		106.9	40.0	156.7	(193.4)
Provision for (benefit from) income taxes		27.1	44.1	40.0	(43.9)
Net income (loss) from continuing operations		79.8	(4.1)	116.7	(149.5)
Net income (loss) from discontinued operations	[1]	(3.3)	(2.6)	(267.0)	(3.3)
Net income (loss)		76.5	(6.7)	(150.3)	(152.8)
Dividends on Preferred Stock		6.0	6.0	18.0	18.0
Net income (loss) attributable to common stockholders		$ 70.5	$ (12.7)	$ (168.3)	$ (170.8)
Weighted-average common stock outstanding:
Basic		69,900,000	68,800,000	69,600,000	68,800,000
Diluted		71,300,000	68,800,000	70,700,000	68,800,000
Net income (loss) per share:
Basic - Continuing operations	[2]	$ 0.93	$ (0.14)	$ 1.42	$ (2.43)
Basic - Discontinued operations	[2]	(0.04)	(0.04)	(3.84)	(0.05)
Basic net income (loss) per share	[2]	0.89	(0.18)	(2.42)	(2.48)
Diluted - Continuing operations	[2]	0.91	(0.14)	1.40	(2.43)
Diluted - Discontinued operations	[2]	(0.04)	(0.04)	(3.78)	(0.05)
Diluted net income (loss) per share	[2]	$ 0.87	$ (0.18)	$ (2.38)	$ (2.48)

[1] See Note 3 for additional information.

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