Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 14.4	$ 10.0	$ 9.8	$ 9.2
Current assets held for sale	16.1	666.9
Non-current assets held for sale	0.0	1,364.0
Current liabilities held for sale	32.9	419.6
Non-current liabilities held for sale	$ 0.0	108.3
Discontinued Operations, Disposed of by Sale | RX Pharmaceuticals
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		10.0
Accounts receivable, net of allowance for credit losses of $1.1		460.7
Allowance for credit loss		1.1
Inventories		140.8
Prepaid expenses and other current assets		55.4
Current assets held for sale		666.9
Property, plant and equipment, net		131.4
Operating lease assets		31.3
Goodwill and indefinite-lived intangible assets		681.2
Definite-lived intangible assets, net		492.8
Deferred income taxes		3.6
Other non-current assets		23.7
Non-current assets held for sale		1,364.0
Total assets held for sale		2,030.9
Accounts payable		92.2
Payroll and related taxes		22.3
Accrued customer programs		237.4
Other accrued liabilities		67.2
Current indebtedness		0.5
Current liabilities held for sale		419.6
Long-term debt, less current portion		0.7
Deferred income taxes		3.1
Other non-current liabilities		104.5
Non-current liabilities held for sale		108.3
Total liabilities held for sale		$ 527.9