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Discontinued Operations - Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 08, 2021
Dec. 31, 2020
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from discontinued operations investing activities:          
Net proceeds from sale of businesses     $ 0.0 $ 58.7 $ 1,491.9
Discontinued Operations, Disposed of by Sale | RX Pharmaceuticals          
Cash flows from discontinued operations operating activities:          
Depreciation and amortization       0.0 15.4
Share-based compensation       0.0 10.8
Gain on sale of business     $ 0.0 0.0 (47.5)
Cash flows from discontinued operations investing activities:          
Asset acquisitions $ (53.3) $ (16.4)   0.0 (69.7)
Additions to property, plant and equipment       0.0 (16.1)
Net proceeds from sale of businesses       $ 53.3 $ 1,491.9