Summary of Significant Accounting Policies (Details) $ in Millions		12 Months Ended
	May 29, 2018 USD ($)	Dec. 31, 2020 USD ($) reportingUnit	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items]
Customer related acruals and allowances		$ 458.7	$ 483.7
Depreciation		90.1	91.0	$ 90.0
Property, Plant and Equipment, Gross [Abstract]
Land		55.6	50.4
Buildings		607.4	578.7
Machinery and equipment		1,342.4	1,195.8
Gross property, plant and equipment		2,005.4	1,824.9
Less accumulated depreciation		(1,009.4)	(922.1)
Property, plant and equipment, net		996.0	902.8	829.1
Operating lease assets		186.0	129.9		$ 164.0
Lease liabilities		$ 193.3	133.7
Number of reporting units | reportingUnit		5
Research and development		$ 177.7	187.4	218.6
Advertising expense		130.5	142.8	159.2
Other Accrued Liabilities and Other Noncurrent Liabilities
Property, Plant and Equipment, Gross [Abstract]
Lease liabilities					$ 166.5
CSCA
Property, Plant and Equipment, Gross [Abstract]
Operating lease assets		22.8	22.4
Lease liabilities		23.2	22.8
CSCI
Property, Plant and Equipment, Gross [Abstract]
Operating lease assets		34.4	41.6
Lease liabilities		$ 35.2	$ 42.4
Omega advertising percentage		85.00%
Minimum | Machinery and Equipment
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)		3 years
Minimum | Building
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)		10 years
Minimum | Software and Software Development Costs
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)		3 years
Maximum | Machinery and Equipment
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)		20 years
Maximum | Building
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)		45 years
Maximum | Software and Software Development Costs
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)		10 years
OTC Version of Nasonex-branded Products | CSCA
Property, Plant and Equipment, Gross [Abstract]
Research and development	$ 50.0			$ 50.0
Foreign currency forward contracts
Summary of Significant Accounting Policies [Line Items]
Maximum remaining maturity of foreign currency derivatives		60 months