Income Taxes - Narrative (Details) € in Millions					12 Months Ended						24 Months Ended
	Mar. 01, 2021 USD ($)	Jan. 13, 2021 USD ($)	May 15, 2020 USD ($)	Aug. 15, 2017 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2020 USD ($)	Dec. 29, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 22, 2019 USD ($)	Apr. 26, 2019 USD ($)	Nov. 29, 2018 EUR (€)
Operating Loss Carryforwards [Line Items]
Dividends received deduction (percent)					100.00%
Unrecognized tax benefits liability, interest and penalties accrued					$ 108,900,000	$ 86,800,000					$ 108,900,000		$ 98,100,000
Unrecognized tax benefits that would impact effective tax rate					250,200,000	203,700,000					250,200,000		$ 204,600,000
Income tax examination, debts subject to limit of deductibility of interest expense														$ 7,500,000,000
Interest rate cap on debts for U.S. tax purposes, as percent of applicable Federal rate			130.00%
Income tax examination, reduction in blended interest rate due to cap for U.S. Federal tax purposes			4.00%
IRS notice of proposed audit adjustment to reduce deductible interest expense for fiscal years 2014 and 2015			$ 414,700,000
Income tax examination, penalties and interest expense				$ 134,100,000			$ 24,700,000	$ 40,100,000	$ 41,800,000	$ 27,500,000
Cumulative deferred charge related to tax litigation					$ 111,600,000						111,600,000
Royalty conceded on all omeprazole sales as a percent of refund claims (percent)					5.24%
IRS notice of proposed audit adjustment from 2011, 2012, and 2013 audit of Athena, including penalty															$ 843,000,000.0
IRS notice of proposed adjustment, penalty (percent)															40.00%
Payment of assessment due before final determination of tax case and appeal					$ 0						0
Tax cuts and jobs act, change in tax rate, income tax expense (benefit)						2,400,000
Tax cuts and jobs act, transition tax for accumulated foreign earnings						17,500,000
Tax cuts and jobs act, undistributed accumulated earnings of foreign subsidiary						1,200,000,000
Tax cuts and jobs act of 2017, transition tax for accumulated foreign earnings, provisional income tax expense (benefit)						6,300,000
Tax cuts and jobs act of 2017, change in tax rate, provisional income tax expense (benefit)						8,300,000
Reduction of income tax expense due to enactment of the CARES Act											36,600,000
Reduction of income tax expense due to change In IRS regulations					8,900,000
Subsequent Event
Operating Loss Carryforwards [Line Items]
IRS Notice of Proposed Audit Adjustment from 2013, 2014 and 2015		$ 141,600,000
Minimum | Subsequent Event
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of additional tax		24,000,000.0
Maximum | Subsequent Event
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of additional tax		$ 112,000,000.0
Forecast
Operating Loss Carryforwards [Line Items]
Income tax examination, estimated increase to tax expense from audit adjustment to fiscal years 2014 and 2015, excluding interest and penalties	$ 170,000,000.0
Income tax examination, estimate of additional tax	$ 200,000,000.0
Irish Revenue
Operating Loss Carryforwards [Line Items]
Unsettled audit assessment from income tax examination | €																€ 1,636
Payment of assessment due before final determination of tax case and appeal					$ 0						$ 0
Israel Tax Authority
Operating Loss Carryforwards [Line Items]
Unsettled audit assessment from income tax examination												$ 63,800,000
Belgium Taxing Authority
Operating Loss Carryforwards [Line Items]
Income tax expense as a result of Belgium Tax Act						24,100,000
Income tax benefit as a result of Belgium Tax Act						$ 33,200,000