Discontinued Operations - Cash Flow Information (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 08, 2021	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from discontinued operations investing activities:
Net proceeds from sale of businesses			$ 58.7	$ 1,491.9	$ 187.8
Discontinued Operations, Disposed of by Sale | RX Pharmaceuticals
Cash flows from discontinued operations operating activities:
Depreciation and amortization			0.0	15.4	97.0
Restructuring charges			0.0	0.0	0.3
Impairment charges			0.0	0.0	346.8
Share-based compensation			0.0	10.8	5.2
Gain on sale of business			0.0	(47.5)	0.0
Cash flows from discontinued operations investing activities:
Asset acquisitions	$ (53.3)	$ (16.4)	0.0	(69.7)	0.9
Additions to property, plant and equipment			0.0	(16.1)	10.2
Net proceeds from sale of businesses			$ 53.3	$ 1,491.9	$ 0.0