Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 03, 2021	Dec. 31, 2020	Mar. 28, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 9.6	$ 10.0	$ 18.7	$ 9.8
Current assets held for sale	1,989.1	666.9
Non-current assets held for sale	0.0	1,364.0
Current liabilities held for sale	450.0	419.6
Non-current liabilities held for sale	0.0	108.3
Discontinued Operations, Disposed of by Sale | RX
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	9.6	10.0
Accounts receivable, net of allowance for credit losses of $1.1 and $1.1, respectively	419.9	460.7
Inventories	136.8	140.8
Prepaid expenses and other current assets	29.7	55.4
Current assets held for sale		666.9
Property, plant and equipment, net	126.4	131.4
Operating lease assets	29.6	31.3
Goodwill and indefinite-lived intangible assets	678.7	681.2
Definite-lived intangible assets, net	533.0	492.8
Deferred income taxes	3.0	3.6
Other non-current assets	22.4	23.7
Non-current assets held for sale		1,364.0
Total assets held for sale	1,989.1	2,030.9
Accounts payable	101.1	92.2
Payroll and related taxes	16.7	22.3
Accrued customer programs	185.9	237.4
Other non-current assets	47.4	67.2
Current indebtedness	0.5	0.5
Current liabilities held for sale		419.6
Other non-current assets	0.6	0.7
Deferred income taxes	2.9	3.1
Other non-current liabilities	94.9	104.5
Non-current liabilities held for sale		108.3
Total liabilities held for sale	450.0	527.9
Allowance for credit losses	$ 1.1	$ 1.1