Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Deferred tax assets, other		$ 103.7	$ 38.9
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent		(4.50%)	(1.90%)	(11.10%)
Statutory rate		21.00%	21.00%	35.00%
Income tax benefit (expense)		$ 1,158.0	$ 1,425.6	$ 2,458.7
Income Taxes Paid		87.0
Deferred tax liabilities, temporary differences, purchase accounting, foreign subsidiaries		1,500.0
GILTI		(1,381.6)	(544.6)
Net impairment on certain tax assets	$ 48.8			48.8
Decrease in Unrecognized Tax Benefits is Reasonably Possible		75.0
Income Taxes (Textual)
Total deferred charges and prepaid taxes		243.8	239.2
Unrecognized tax benefit	64.3	122.7	109.1	64.3
Net interest expense		4.7	2.2	4.8
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		20.0	$ 13.8
2017 Tax Act
Tax Credit Carryforward [Line Items]
Statutory rate			21.00%
Income tax benefit (expense)				1,200.0
Transition toll tax liabilities	989.6	697.0		989.6
Income tax expense (benefit)	184.0		$ 12.7
Reduction in deferred tax liability, undistributed foreign earnings			34.6
GILTI			135.8
Other tax expense (benefit)			$ 11.0
General Business | Domestic Country
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.7
Tax Credit Carryforward, Amount		1.3
General Business | State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local		4.6
General Business | Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		1,773.8
Research | State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount		133.8
Prepaid taxes
Tax Credit Carryforward [Line Items]
Net impairment on certain tax assets	$ 142.6			$ 142.6
Earnings in the form of cash and cash equivalents | 2017 Tax Act
Tax Credit Carryforward [Line Items]
Transition Toll Tax repatriation tax rate	15.50%			15.50%
Other Foreign Earnings | 2017 Tax Act
Tax Credit Carryforward [Line Items]
Transition Toll Tax repatriation tax rate	8.00%			8.00%
ZINBRYTA
Tax Credit Carryforward [Line Items]
Unrecorded tax benefit				$ 93.8
Minimum
Tax Credit Carryforward [Line Items]
Residual U.S. tax liability on reversal of deferred tax liabilities on foreign subsidiaries purchase accounting		300.0
Maximum
Tax Credit Carryforward [Line Items]
Residual U.S. tax liability on reversal of deferred tax liabilities on foreign subsidiaries purchase accounting		400.0
Denmark Manufacturing Operations
Tax Credit Carryforward [Line Items]
Tax expense on disposal group		68.9
Intellectual Property
Tax Credit Carryforward [Line Items]
Deferred Tax Liabilities, Other		603.3
Deferred tax assets, other		$ 754.1