Discontinued Operations - Results of Discontinued Operations (Details) - Discontinued Operations, Disposed of by Sale - RX Pharmaceuticals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 0.0	$ 0.0	$ 405.1
Cost of sales	0.0	0.0	258.4
Gross profit	0.0	0.0	146.7
Distribution	0.0	0.0	6.1
Research and development	0.0	0.0	30.8
Selling	0.0	0.0	16.3
Administration	10.4	4.6	36.4
Other operating income, net	0.0	0.0	(0.4)
Total operating expenses	10.4	4.6	89.2
Operating (loss) income	(10.4)	(4.6)	57.5
Interest expense, net	0.0	0.0	0.8
Other income, net	0.0	0.0	(1.6)
(Loss) income from discontinued operations before tax	(10.4)	(4.6)	58.3
Gain on sale of business	0.0	0.0	(47.5)
(Loss) income before income taxes	(10.4)	(4.6)	105.8
Income tax (benefit) expense	(2.1)	5.1	43.8
(Loss) income from discontinued operations, net of tax	$ (8.3)	$ (9.7)	$ 62.0